Store multivariate proposal in MHProposalState

[oschulz]

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[codecov]

Codecov Report

Attention: Patch coverage is 39.28571% with 17 lines in your changes missing coverage. Please review.

Project coverage is 49.33%. Comparing base (ab202a2) to head (4bbe199).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/samplers/mcmc/mh_sampler.jl	39.28%	17 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #458      +/-   ##
==========================================
- Coverage   49.46%   49.33%   -0.13%     
==========================================
  Files         121      121              
  Lines        5691     5708      +17     
==========================================
+ Hits         2815     2816       +1     
- Misses       2876     2892      +16     

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