#### Why I did it
The testcases in sonic-mgmt need the packages of protobuf and dashapi
##### Work item tracking
- Microsoft ADO **(number only)**:
#### How I did it
Because the docker of sonic-mgmt is based on ubuntu20.04, it cannot directly install the packages compiled by slave due to dependency issues. Download related packaged directly from Azp.
#### How to verify it
Check azp stats.
Why I did it
For the DASH scenario, the APP_DB will be optimized by protobuf message for less memory consumption.
How I did it
Download the Debian package of protobuf 3.21.12 and create a corresponding rule for building it.
Add a submodule of sonic-dash-api and generated its Debian package which includes C++ library and Python library
How to verify it
Check artifacts of Azp that the protobuf-related and dash-api deb packages should be generated.
Signed-off-by: Ze Gan <ganze718@gmail.com>