Add YANG model for FABRIC_PORT (#15629)

#### Why I did it

Introduce YANG model for FABRIC in CONFIG_DB, which was added in https://github.com/sonic-net/sonic-buildimage/pull/14170.

#### How I did it

This is a clone of @jfeng-arista's PR https://github.com/sonic-net/sonic-buildimage/pull/14282 to resolve conflicts with upstream changes. 

#### How to verify it

Passing pipeline build is sufficient.

src/sonic-config-engine/tests/test_cfggen_from_yang.py

@@ -276,3 +276,14 @@ class TestCfgGen(object):
                 "monPollThreshRecovery": "8"
             }
         })
+
+    def test_fabric_port_table(self):
+        arg = ["--var-json", "FABRIC_PORT"]
+        output = json.loads(self.run_script_with_yang_arg(arg))
+        assert(output == {\
+            "Fabric0": {
+                "alias": "Fabric0",
+                "isolateStatus": "False",
+                "lanes": "0"
+            }
+        })

src/sonic-config-engine/tests/test_yang_data.json

@@ -388,5 +388,17 @@
                 "monPollThreshRecovery": "8"
             }
         }
+    },
+    "sonic-fabric-port:sonic-fabric-port": {
+        "sonic-fabric-port:FABRIC_PORT": {
+            "FABRIC_PORT_LIST": [
+                {
+                    "name": "Fabric0",
+                    "alias": "Fabric0",
+                    "isolateStatus": "False",
+                    "lanes": "0"
+                }
+            ]
+        }
     }
 }

src/sonic-yang-models/doc/Configuration.md

@@ -34,6 +34,7 @@ Table of Contents
          * [FG_NHG_MEMBER](#fg_nhg_member)
          * [FG_NHG_PREFIX](#fg_nhg_prefix)
          * [FABRIC_MONITOR](#fabric-monitor)
+         * [FABRIC_PORT](#fabric-port)
          * [FLEX_COUNTER_TABLE](#flex_counter_table)
          * [Hash](#hash)
          * [IPv6 Link-local] (#ipv6-link-local)
@@ -1063,6 +1064,24 @@ The FG_NHG_PREFIX table provides the FG_NHG_PREFIX for which FG behavior is desi
 
 ```
 
+### FABRIC_PORT
+```
+{
+"FABRIC_PORT": {
+    "Fabric0": {
+        "alias": "Fabric0",
+        "isolateStatus": "False",
+        "lanes": "0"
+    },
+    "Fabric1": {
+        "alias": "Fabric1",
+        "isolateStatus": "False",
+        "lanes": "1"
+    }
+  }
+}
+
+```
 
 ### MPLS_TC_TO_TC_MAP
 ```

src/sonic-yang-models/setup.py

@@ -117,6 +117,7 @@ setup(
                          './yang-models/sonic-events-syncd.yang',
                          './yang-models/sonic-extension.yang',
                          './yang-models/sonic-fabric-monitor.yang',
+                         './yang-models/sonic-fabric-port.yang',
                          './yang-models/sonic-flex_counter.yang',
                          './yang-models/sonic-fine-grained-ecmp.yang',
                          './yang-models/sonic-feature.yang',
@@ -210,6 +211,7 @@ setup(
                          './cvlyang-models/sonic-device_neighbor_metadata.yang',
                          './cvlyang-models/sonic-extension.yang',
                          './cvlyang-models/sonic-fabric-monitor.yang',
+                         './cvlyang-models/sonic-fabric-port.yang',
                          './cvlyang-models/sonic-flex_counter.yang',
                          './cvlyang-models/sonic-feature.yang',
                          './cvlyang-models/sonic-fine-grained-ecmp.yang',

src/sonic-yang-models/tests/files/sample_config_db.json

@@ -1275,6 +1275,18 @@
                 "monPollThreshRecovery": "8"
             }
         },
+        "FABRIC_PORT": {
+            "Fabric0": {
+                "alias": "Fabric0",
+                "isolateStatus": "False",
+                "lanes": "0"
+            },
+            "Fabric1": {
+                "alias": "Fabric1",
+                "isolateStatus": "False",
+                "lanes": "1"
+            }
+        },
         "FLEX_COUNTER_TABLE": {
             "PFCWD": {
                 "FLEX_COUNTER_STATUS": "enable"

src/sonic-yang-models/tests/yang_model_tests/tests/fabric_port.json

@@ -0,0 +1,5 @@
+{
+    "FABRIC_PORT_POSITIVE_CONFIG": {
+        "desc": "Configure FABRIC_PORT no failure."
+    }
+}

src/sonic-yang-models/tests/yang_model_tests/tests_config/fabric_port.json

@@ -0,0 +1,16 @@
+{
+    "FABRIC_PORT_POSITIVE_CONFIG": {
+        "sonic-fabric-port:sonic-fabric-port": {
+            "sonic-fabric-port:FABRIC_PORT": {
+                "FABRIC_PORT_LIST": [
+                    {
+                        "name": "Fabric0",
+                        "alias": "Fabric0",
+                        "isolateStatus": "False",
+                        "lanes": "0"
+                    }
+                ]
+            }
+        }
+    }
+}

src/sonic-yang-models/yang-models/sonic-fabric-port.yang

@@ -0,0 +1,61 @@
+module sonic-fabric-port{
+
+    yang-version 1.1;
+
+    namespace "http://github.com/sonic-net/sonic-fabric-port";
+    prefix fabric-port;
+
+    import sonic-types {
+       prefix stypes;
+    }
+
+    description "FABRIC_PORT yang Module for SONiC OS";
+
+    revision 2023-03-14 {
+        description "First Revision";
+    }
+
+    container sonic-fabric-port {
+
+        container FABRIC_PORT {
+
+            description "FABRIC_PORT part of config_db.json";
+
+            list FABRIC_PORT_LIST {
+
+                key "name";
+
+                leaf name {
+                    type string {
+                        length 1..128;
+                    }
+                }
+
+                leaf isolateStatus {
+                    description "Isolation status of a fabric port";
+                    type stypes:boolean_type;
+                    default "False";
+                }
+
+                leaf alias {
+                    description "Alias of a fabric port";
+                    type string {
+                        length 1..128;
+                    }
+                }
+
+                leaf lanes {
+                    description "Lanes of a fabric port";
+                    mandatory true;
+                    type string {
+                        length 1..128;
+                    }
+                }
+
+            } /* end of list FABRIC_PORT_LIST */
+
+        } /* end of container FABRIC_PORT */
+
+    } /* end of container sonic-fabric-port */
+
+} /* end of module sonic-fabric-port */