Precompile symbolic_solve in SymbolicsGroebnerExt.jl

[zengmao]

Currently, symbolic_solve, which uses the Groebner.jl package extension, takes about 20 seconds to run for the first time on my laptop for very simple linear equations. I've added precompilation statements (using PrecompileTools) in the file SymbolicsGroebnerExt.jl to significantly reduce the latency for users, following some discussions on Discourse:
https://discourse.julialang.org/t/new-symbolic-solver-for-symbolics-jl/

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.81%. Comparing base (47cfd60) to head (13d46cd).
Report is 13 commits behind head on master.

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Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1233       +/-   ##
===========================================
+ Coverage    8.30%   79.81%   +71.50%     
===========================================
  Files          46       46               
  Lines        4549     4622       +73     
===========================================
+ Hits          378     3689     +3311     
+ Misses       4171      933     -3238     

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