Grarco/outsource masp sig verification rebase murisi

[grarco]

Describe your changes

Indicate on which release or other PRs this topic is based on

Checklist before merging to draft

• I have added a changelog
• Git history is in acceptable state

[codecov]

Codecov Report

Attention: Patch coverage is 12.14953% with 94 lines in your changes missing coverage. Please review.

Project coverage is 53.46%. Comparing base (8479d38) to head (dab10a6).
Report is 4 commits behind head on main.

Files	Patch %	Lines
crates/namada/src/ledger/native_vp/masp.rs	0.00%	82 Missing ⚠️
crates/tx/src/action.rs	54.54%	5 Missing ⚠️
crates/trans_token/src/storage.rs	0.00%	4 Missing ⚠️
crates/tx_prelude/src/token.rs	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3528      +/-   ##
==========================================
- Coverage   53.48%   53.46%   -0.02%     
==========================================
  Files         320      320              
  Lines      110000   110031      +31     
==========================================
- Hits        58832    58828       -4     
- Misses      51168    51203      +35     

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