fix(coset): shl overflow when getting the points

[0xLucqs]

For higher degree polynomials the twiddles weren't computed correctly because computing the coset size would overflow. Fixed that by switching to u32 and added tests for higher degree polynomials

[diegokingston]

Hi! Thanks for the catch. In order to merge it, we need your commits to be signed (you can configure this by adding a signing key to your profile) and force pushing them.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.05%. Comparing base (ca84326) to head (16d20c7).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #994   +/-   ##
=======================================
  Coverage   72.05%   72.05%           
=======================================
  Files         160      160           
  Lines       35122    35130    +8     
=======================================
+ Hits        25306    25314    +8     
  Misses       9816     9816           

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