refactor: switch admin create_queue from protobuf to binary encoding

[vieiralucas]

Summary

• Update test helper create_queue from hand-encoded protobuf to binary wire format
• New binary_encode_create_queue method uses queue_len:u16 + queue + on_enqueue_len:u16 + on_failure_len:u16 + visibility_timeout_ms:u32

Test plan

• Existing tests pass against a FIBP server with binary admin encoding (PR #153)
• No protobuf encoding remains in test infrastructure

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Summary by cubic

Switch the admin CreateQueue test helper from protobuf to the binary wire format to match the server’s admin protocol. This removes protobuf-specific logic and keeps tests compatible with binary admin servers.

• Refactors
  • Added binary_encode_create_queue using: queue_len:u16 + queue:utf8 + on_enqueue_len:u16 + on_enqueue:utf8 + on_failure_len:u16 + on_failure:utf8 + visibility_timeout_ms:u32.
  • Replaced proto_encode_create_queue usage and removed the method.
  • UTF‑8 queue name with no 127‑byte limit; on_enqueue/on_failure set empty; visibility_timeout_ms set to 0.

^{Written for commit 5048cf8. Summary will update on new commits.}

[cubic-dev-ai]

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