Is your feature request related to a problem? Please describe.

The pyzee internals are using unknown imports and some non proto Stub generated type classes.
The package zeebe-grpc does not provide python class files from protobuf. And uses older versions of grpcio and protobuf.

Describe the solution you'd like
Generate the protobuf stubs and interface (.pyi) for Python ourselfs and remove the dependency from zeebe-grpc.
This also enhances type hints because of the usage of the protobuf generated interface for pyzeebe.

There is also the option to create mypy types from protobuf.

python -m grpc_tools.protoc --proto_path=. --python_out=. --grpc_python_out=. --pyi_out=. ./pyzeebe/proto/gateway.proto

For this we need to add the following requirements:

1. grpcio = ">=1.66.0"
2. grpcio-tools = ">=1.66.0"
3. protobuf = ">=5.27.2,<5.28.0"

Additional context

https://grpc.io/docs/languages/python/basics/#generating-client-and-server-code
https://mypy.readthedocs.io/en/stable/stubs.html