Add Term

[blegat]

Taken from MultivariatePolynomials

[codecov]

Codecov Report

❌ Patch coverage is 63.04348% with 34 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.81%. Comparing base (c1e156d) to head (6c37989).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
src/term.jl	63.04%	34 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #128      +/-   ##
==========================================
- Coverage   92.30%   89.81%   -2.50%     
==========================================
  Files          15       16       +1     
  Lines         988     1080      +92     
==========================================
+ Hits          912      970      +58     
- Misses         76      110      +34     

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