Add WeightedSOSCone

[blegat]

@chriscoey @lkapelevich This will finally allow to directly hook into Hypatia.WSOSInterpNonnegative.

Needs

• Equality between bases JuliaAlgebra/MultivariateBases.jl#24
• Add any function for Bridges.runtests MathOptInterface.jl#2497

[codecov]

Codecov Report

Attention: Patch coverage is 1.92308% with 51 lines in your changes are missing coverage. Please review.

Project coverage is 83.36%. Comparing base (c4f7e9a) to head (086b017).
Report is 6 commits behind head on master.

❗ Current head 086b017 differs from pull request most recent head 460609b. Consider uploading reports for the commit 460609b to get more accurate results

Files	Patch %	Lines
src/Bridges/Variable/kernel.jl	0.00%	45 Missing ⚠️
src/sets.jl	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #351      +/-   ##
==========================================
- Coverage   85.10%   83.36%   -1.75%     
==========================================
  Files          41       41              
  Lines        2222     2272      +50     
==========================================
+ Hits         1891     1894       +3     
- Misses        331      378      +47     

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