API changes plus support for Optimization.jl

[oschulz]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 83.83838% with 16 lines in your changes missing coverage. Please review.

Project coverage is 71.84%. Comparing base (bcc996f) to head (34d2048).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/mgvi_impl.jl	75.67%	9 Missing ⚠️
src/residual_samplers.jl	81.81%	6 Missing ⚠️
ext/MGVIOptimizationExt.jl	90.90%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #50      +/-   ##
==========================================
+ Coverage   71.57%   71.84%   +0.27%     
==========================================
  Files           8       10       +2     
  Lines         292      341      +49     
==========================================
+ Hits          209      245      +36     
- Misses         83       96      +13     

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