Add liftFresh to lift a Fresh into MonadFresh

[lsrcz]

This pull request resolves #114. A liftFresh function is added to lift a Fresh value into any MonadFresh.

This pull request also changed the API to MonadFresh as the previous API isn't general enough.

[codecov]

Codecov Report

Attention: 26 lines in your changes are missing coverage. Please review.

Comparison is base (05f225b) 52.64% compared to head (a8d3b05) 52.65%.

❗ Current head a8d3b05 differs from pull request most recent head 58028e5. Consider uploading reports for the commit 58028e5 to get more accurate results

Files	Patch %	Lines
src/Grisette/Core/Data/Class/GenSym.hs	29.72%	24 Missing and 2 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #156   +/-   ##
=======================================
  Coverage   52.64%   52.65%           
=======================================
  Files          66       66           
  Lines        5744     5764   +20     
  Branches      442      443    +1     
=======================================
+ Hits         3024     3035   +11     
- Misses       2278     2286    +8     
- Partials      442      443    +1     

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