In Groebner extension, partially fix ordering

[sumiya11]

Addresses #1323.

using Symbolics, Groebner
@variables t S(t) R(t);
groebner_basis([-12 + 5S, 2 + 5R], ordering=Lex(S, R)); # tres bien

The following still does not work:

groebner_basis([-12 + 5S, 2 + 5R], ordering=Lex(S, R, t));

It would be reasonable if it worked. This case would better be handled on Symbolics side when converting expressions to DynamicPolynomials. Groebner does not know about extra variables such as t.

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.98%. Comparing base (e036266) to head (093b273).
Report is 26 commits behind head on master.

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Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1324       +/-   ##
===========================================
+ Coverage    3.80%   78.98%   +75.18%     
===========================================
  Files          47       47               
  Lines        4602     4707      +105     
===========================================
+ Hits          175     3718     +3543     
+ Misses       4427      989     -3438     

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