Masp tests

[grarco]

Describe your changes

Partially addresses #3836.
Partially addresses #3828.

Adds more integration test for the MASP including some tests with tx batches.
Adds some protests for the MASP vp.

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
• If this PR requires changes to the docs or specs, a corresponding PR is opened in the namada-docs repo
  • Relevant PR if applies:
• If this PR affects services such as namada-indexer or namada-masp-indexer, a corresponding PR is opened in that repo
  • Relevant PR if applies:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.25%. Comparing base (a98a2ec) to head (16f3bb9).
Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3840      +/-   ##
==========================================
+ Coverage   73.21%   73.25%   +0.03%     
==========================================
  Files         341      341              
  Lines      105280   105334      +54     
==========================================
+ Hits        77081    77158      +77     
+ Misses      28199    28176      -23     

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[batconjurer]

you love to see it