Polynomial: differentiate & print methods.

[feltroidprime]

Rationale :

• differentiate can be useful

• printing nicely the poly as well

• Will enable drop-in replacement in Garaga for the Polynomial struct.

Thank you! :)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 96.42857% with 2 lines in your changes missing coverage. Please review.

Project coverage is 71.12%. Comparing base (e14cf2b) to head (cae0f12).

Files with missing lines	Patch %	Lines
math/src/polynomial/mod.rs	96.42%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #929      +/-   ##
==========================================
+ Coverage   71.08%   71.12%   +0.04%     
==========================================
  Files         144      144              
  Lines       31824    31880      +56     
==========================================
+ Hits        22622    22676      +54     
- Misses       9202     9204       +2     

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