Fixed some bugs, symbolic_solve(single expr, [multiple_vars]), and precompiled nemo

[n0rbed]

Now symbolic_solve supports expressions such as

symbolic_solve((x - y) * (x - z), [x, y, z])

and similar. Also, added precompile tool hooks (i think they're called that) to nemo.

julia> @time symbolic_solve([x^2 - a^2, x + a], x)
  7.805655 seconds (17.50 M allocations: 1.169 GiB, 2.76% gc time, 99.79% compilation time: <1% of which was recompilation)
1-element Vector{SymbolicUtils.BasicSymbolic{Real}}:
 -a

julia> @time symbolic_solve([x^2 - a^2, x + a], x)
  0.511816 seconds (1.28 M allocations: 85.815 MiB, 3.62% gc time, 98.22% compilation time)
1-element Vector{SymbolicUtils.BasicSymbolic{Real}}:
 -a

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Codecov Report

Attention: Patch coverage is 81.81818% with 2 lines in your changes missing coverage. Please review.

Project coverage is 79.89%. Comparing base (47cfd60) to head (bf454dc).
Report is 16 commits behind head on master.

Files	Patch %	Lines
src/solver/main.jl	33.33%	2 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1234       +/-   ##
===========================================
+ Coverage    8.30%   79.89%   +71.58%     
===========================================
  Files          46       46               
  Lines        4549     4631       +82     
===========================================
+ Hits          378     3700     +3322     
+ Misses       4171      931     -3240     

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