#### Why I did it
Currently at the Azure build system, the P4RT container is disabled by default at the build time. Here the goal is to include the P4RT container at the build time while disabling it at the runtime. The user can enable/disable the p4rt app through the config based on the preference.
#### How I did it
Changed the config in rules/config and init-cfg.json.j2
#### Why I did it
SONiC is migrating to bullseye. This will update the sonic-pins container to bullseye.
#### How I did it
The [sonic-pins code](https://github.com/Azure/sonic-buildimage/blob/master/rules/p4rt.mk) isn't dependent on any architecture so it will already build successfully for bullseye. This PR updates the docker to use bullseye.
#### How to verify it
Today we cannot build the docker-sonic-p4rt.gz target (e.g. Issue #9885). With this change the docker will build successfully. The P4RT executable will not run, because of a missing runtime library, libgmpxx, which I'll address in a followup PR.
#### Description for the changelog
Update docker-sonic-p4rt.gz target to build with Bullseye instead of Buster.
- Add INCLUDE_PINS to config to enable/disable container
- Add Docker files and supporting resources
- Add sonic-pins submodule and associated make files
Submission containing materials of a third party:
Copyright Google LLC; Licensed under Apache 2.0
#### Why I did it
Adds P4RT container to SONiC for PINS
The P4RT app is covered by this HLD:
https://github.com/pins/SONiC/blob/master/doc/pins/p4rt_app_hld.md
#### How I did it
Followed the pattern and templates used for other SONiC applications
#### How to verify it
Build SONiC with INCLUDE_P4RT set to "y".
Verify that the resulting build has a container called "p4rt" running.
You can verify that the service is up by running the following command on the SONiC switch:
```bash
sudo netstat -lpnt | grep p4rt
```
You should see the service listening on TCP port 9559.
#### Which release branch to backport (provide reason below if selected)
None
#### Description for the changelog
Build P4RT container for PINS
