feat(multisig-prover): add permission control to multisig-prover

[cgorenflo]

AXE-4487

[codecov]

Codecov Report

Attention: Patch coverage is 99.00498% with 2 lines in your changes missing coverage. Please review.

Project coverage is 93.71%. Comparing base (deab56a) to head (c9b046d).

Files	Patch %	Lines
contracts/multisig-prover/src/contract.rs	96.36%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #526      +/-   ##
==========================================
+ Coverage   93.69%   93.71%   +0.02%     
==========================================
  Files         184      185       +1     
  Lines       25904    26041     +137     
==========================================
+ Hits        24270    24405     +135     
- Misses       1634     1636       +2     

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