Register proto files to buf.build

[zemyblue]

Summary

Register proto files of lbm-sdk to buf.build

Problem Definition

Every time we should explain developers what is changed, how to use gRPC, etc.
But I think we reduce the effort if we register our gRPC information to buf.build.

Proposal

The proto file of lbm-sdk need to be registered in buf.build so that users using the chain can refer to the gRPC information.

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For Admin Use

• Not duplicate issue
• Appropriate labels applied
• Appropriate contributors tagged
• Contributor assigned/self-assigned

[0Tech]

Possible duplicate: #491

[zemyblue]

I'll close this issue.