Added version information to protobuf structs

[greg-szabo]

A minor enhancement that allows the tendermint-proto crate users to check what the source of the protobuf structs are.

tendermint_proto::meta::REPOSITORY and tendermint_proto::meta::COMMITISH are autogenerated constants when creating the structs.

Edit: it also fixes a random issue with git2::Oid::from_str(). It didn't surface before and it might be a bug in the patch version of git2 but this way it's slightly more robust.

Edit2: This is in preparation for the final Go v0.34.0-compatible Tendermint-rs v0.17.0. There will be another PR where we update the version number and fix the breaking changes.

• Referenced an issue explaining the need for the change
• Updated all relevant documentation in docs
• Updated all code comments where relevant
• Wrote tests
• Updated CHANGELOG.md

[codecov-io]

Codecov Report

Merging #733 (614a099) into master (d3d16be) will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #733   +/-   ##
======================================
  Coverage    42.5%   42.5%           
======================================
  Files         202     202           
  Lines       12905   12905           
  Branches     3298    3298           
======================================
  Hits         5496    5496           
  Misses       7059    7059           
  Partials      350     350           

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[melekes]

👍