Add localFreshIdent

[lsrcz]

This pull request adds a combinator to locally change the identifier for the MonadFresh. It also resets the index in the local block.

[codecov]

Codecov Report

Attention: Patch coverage is 21.05263% with 15 lines in your changes are missing coverage. Please review.

Project coverage is 60.04%. Comparing base (54ef499) to head (bcec46a).

Files	Patch %	Lines
src/Grisette/Core/Data/Class/GenSym.hs	21.05%	14 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #190      +/-   ##
==========================================
- Coverage   60.18%   60.04%   -0.14%     
==========================================
  Files          72       72              
  Lines        6146     6165      +19     
  Branches      502      504       +2     
==========================================
+ Hits         3699     3702       +3     
- Misses       1945     1959      +14     
- Partials      502      504       +2     

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