removed solve_multipoly

[n0rbed]

Since now solve_multivar can handle all cases solved by solve_multipoly, therefore the GCD usage is unnecessary given Groebner basis can handle more generalized input (this pr for example).

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 75.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 37.57%. Comparing base (47cfd60) to head (1d797fb).
Report is 89 commits behind head on master.

Files with missing lines	Patch %	Lines
src/solver/main.jl	75.00%	3 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1259       +/-   ##
===========================================
+ Coverage    8.30%   37.57%   +29.26%     
===========================================
  Files          46       46               
  Lines        4549     4559       +10     
===========================================
+ Hits          378     1713     +1335     
+ Misses       4171     2846     -1325     

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[ChrisRackauckas]

Real test failures.

[n0rbed]

Real test failures.

fixed

[n0rbed]

i dont think the tests failing in core are related to me