fix: set missing fields in postgresRevision.MarshalBinary

[ostafen]

Description

This change sets OptionalTxid and OptionalTimestamp when marshalling a postgres revision to probuf.

Testing

Add test case to TestRevisionSerDe.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.02%. Comparing base (82ab4d3) to head (ef171d7).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2708      +/-   ##
==========================================
- Coverage   77.10%   77.02%   -0.07%     
==========================================
  Files         462      462              
  Lines       49007    49009       +2     
==========================================
- Hits        37781    37746      -35     
- Misses       8458     8485      +27     
- Partials     2768     2778      +10     

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