remove third_party/proto, and use buf registry for proto deps

[yaruwangway]

Summary

Presently, the proto deps are copied to gaia/third_party/proto. This causes extra works of copying when the dependencies version updates.

From sdk 0.46 onwards, we can use refer to buf registry for proto deps
This was done before when we were trying to use 0.46 (finally reverted to sdk 0.45)

Problem Definition

Concerns

Copy pasting proto files are tedious and error-prone.

Proposal

remove third_party/proto and use buf registry.

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[mpoke]

Closing as this work is tracked by #2540