Generate gRPC client for Frontier APIs

[rohilsurana]

Problem

The current frontier-python SDK uses REST endpoints, but Frontier now exposes gRPC/Connect endpoints on port 8082. Python clients need a gRPC client to connect to these endpoints.

Solution

Generate a Python gRPC client from Frontier's protobuf definitions using Buf. Since Connect is backward compatible with gRPC, a standard gRPC Python client should work seamlessly with Frontier's Connect endpoints.

Implementation

Use Buf to generate the gRPC Python client:

1. Add buf.gen.yaml configuration:

version: v1
plugins:
  - plugin: buf.build/protocolbuffers/python
    out: gen
  - plugin: buf.build/grpc/python
    out: gen

2. Generate client:

buf generate

This will generate standard gRPC Python stubs that work with both gRPC and Connect protocols.