[RRIO][Python] Add python grpc binding for mock API (#29129)

* add python grpc binding for mock api

* add licenses

* update python version for buf plugin

* add poetry for python dependencies

* add license

* del author,desc

* update package for pyproject

* update python path

.test-infra/mock-apis/README.md

@@ -62,6 +62,7 @@ TODO: See https://github.com/apache/beam/issues/28859
 | [go](https://go.dev)                                | For making code changes in this directory. See [go.mod](go.mod) for required version.  |
 | [buf](https://github.com/bufbuild/buf#installation) | Optional for when making changes to proto.                                             |
 | [ko](https://ko.build/install/)                     | To easily build Go container images.                                                   |
+| [poetry](https://python-poetry.org/)                     | To manage python dependencies.                                                   |
 
 # Testing
 

.test-infra/mock-apis/buf.gen.yaml

@@ -37,4 +37,8 @@ plugins:
 - name: java
   out: src/main/java
 - name: grpc-java
-  out: src/main/java
+  out: src/main/java
+- plugin: buf.build/protocolbuffers/python:v24.4
+  out: src/main/python
+- plugin: buf.build/grpc/python:v1.59.1
+  out: src/main/python