Add Tx, SignDoc, etc. proto types from 6111

[aaronc]

ref: #6213, #6111

This PR:

• adds the Tx, SignDoc, etc. types from Update ADR 020 to use Any #6111 to tx/types
• adds CompactBitArray to crypto/types

It postpones actually implementing any new signing behavior to separate PRs.

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[codecov]

Codecov Report

Merging #6214 into master will not change coverage.
The diff coverage is 33.33%.

@@           Coverage Diff           @@
##           master    #6214   +/-   ##
=======================================
  Coverage   54.84%   54.84%           
=======================================
  Files         444      444           
  Lines       26771    26771           
=======================================
  Hits        14682    14682           
  Misses      11046    11046           
  Partials     1043     1043           

[aaronc]

@alexanderbez I fixed the protocgen.sh script and moved to types/tx. Does that work?

[aaronc]

Going to go ahead and merge this. There are a lot of pieces to get to

[alexanderbez]

Great work @aaronc 👏