Allow specifying a specific commit of the SDK to check out when compiling protos

[romac]

Crate

proto-compiler and ibc-proto

Summary

Allow specifying a specific commit of the SDK to check out when compiling protos.

Problem Definition

We currently have no idea which version of the SDK the protos we compile to Rust code are from, because the proto-compiler crate checks the latest master of the SDK when cloning it.

Proposal

a) Specify which commit to checkout when we clone the SDK with proto-compiler
b) Expose the commit at which we fetched the .proto definitions in the ibc-proto library

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