Batch reveal_pk

[grarco]

Describe your changes

Closes #1879.

When the client detects that an extra reveal_pk transaction is needed, instead of submitting it as a separate tx before the intended one, it now groups the two (or more) transactions together and submits them as a single batch.

Checklist before merging

• If this PR has some consensus breaking changes, I added the corresponding breaking:: labels
  • This will require 2 reviewers to approve the changes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.03%. Comparing base (cc0a448) to head (3f8c058).
Report is 14 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3720      +/-   ##
==========================================
+ Coverage   68.01%   68.03%   +0.02%     
==========================================
  Files         330      330              
  Lines      116209   116268      +59     
==========================================
+ Hits        79041    79106      +65     
+ Misses      37168    37162       -6     

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