Add instances for Ratio

[lsrcz]

This pull request adds instances for Ratio.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 41 lines in your changes missing coverage. Please review.

Project coverage is 52.39%. Comparing base (73f625a) to head (a6f712f).
Report is 4 commits behind head on main.

Files	Patch %	Lines
src/Grisette/Internal/Core/Data/Class/ToCon.hs	0.00%	9 Missing ⚠️
src/Grisette/Internal/Core/Data/Class/PPrint.hs	0.00%	6 Missing ⚠️
src/Grisette/Internal/Core/Data/Class/EvalSym.hs	0.00%	3 Missing ⚠️
...rc/Grisette/Internal/Core/Data/Class/ExtractSym.hs	0.00%	3 Missing ⚠️
src/Grisette/Internal/Core/Data/Class/Mergeable.hs	0.00%	3 Missing ⚠️
src/Grisette/Internal/Core/Data/Class/SymOrd.hs	0.00%	3 Missing ⚠️
src/Grisette/Internal/Core/Data/Class/GenSym.hs	0.00%	2 Missing ⚠️
src/Grisette/Internal/Core/Data/Class/SubstSym.hs	0.00%	2 Missing ⚠️
src/Grisette/Internal/Core/Data/Class/SymEq.hs	0.00%	2 Missing ⚠️
src/Grisette/Internal/Core/Data/Class/ToSym.hs	0.00%	2 Missing ⚠️
... and 3 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #251      +/-   ##
==========================================
- Coverage   52.54%   52.39%   -0.15%     
==========================================
  Files         120      120              
  Lines       10163    10203      +40     
  Branches      945      939       -6     
==========================================
+ Hits         5340     5346       +6     
- Misses       3878     3918      +40     
+ Partials      945      939       -6     

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