refactor: switch admin ops from protobuf to binary encoding

[vieiralucas]

Summary

• Remove protobuf runtime dependency and all generated proto files (fila/v1/, proto/)
• Remove grpcio, grpcio-tools, mypy-protobuf from dev dependencies
• Update test conftest create_queue to use binary wire format instead of protobuf serialization
• Remove encode_admin helper from fibp.py

Test plan

• python -c "import fila" succeeds (verified locally)
• Integration tests pass against a FIBP server with binary admin encoding (PR #153)
• No protobuf imports remain in the codebase

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Summary by cubic

Switch admin operations from protobuf payloads to a custom binary encoding to simplify the client and remove gRPC/protobuf dependencies. This reduces install size and removes all generated proto files.

• Refactors

  • Admin frames now use binary bodies; removed encode_admin and use _encode_frame directly.
  • Deleted generated modules under fila/v1/ and all proto/ sources.
  • Updated test create_queue to build the admin body in binary: queue_len:u16 + queue:utf8 + on_enqueue_len:u16 + on_failure_len:u16 + visibility_timeout_ms:u32.

• Dependencies

  • Dropped protobuf (runtime) and dev deps grpcio, grpcio-tools, mypy-protobuf.
  • Cleaned pyproject.toml and removed mypy/ruff config tied to deleted modules.

^{Written for commit 1f60ea5. Summary will update on new commits.}

[cubic-dev-ai]

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