Test MASP inverse conversions

[grarco]

Describe your changes

Adds tests for the MASP inverse conversions.

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 74.62%. Comparing base (c993d59) to head (f0e36a7).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4193      +/-   ##
==========================================
+ Coverage   74.58%   74.62%   +0.04%     
==========================================
  Files         342      342              
  Lines      108433   108554     +121     
==========================================
+ Hits        80876    81011     +135     
+ Misses      27557    27543      -14     

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[brentstone]

Should this be merged now?

[grarco]

Should this be merged now?

We are blocked by 4146