Add MGVI and rename several things in API

[oschulz]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 74.74048% with 73 lines in your changes missing coverage. Please review.

Project coverage is 49.46%. Comparing base (4d23dc6) to head (ab202a2).
Report is 13 commits behind head on main.

Files with missing lines	Patch %	Lines
src/extdefs/mgvi_defs.jl	30.76%	9 Missing ⚠️
src/utils/error_log.jl	0.00%	7 Missing ⚠️
src/algotypes/bat_context.jl	60.00%	6 Missing ⚠️
src/algotypes/transform_algorithm.jl	78.57%	6 Missing ⚠️
ext/BATMGVIExt.jl	94.25%	5 Missing ⚠️
src/transforms/trafo_utils.jl	37.50%	5 Missing ⚠️
src/measures/bat_measure.jl	0.00%	4 Missing ⚠️
src/measures/example_posterior.jl	78.94%	4 Missing ⚠️
src/samplers/evaluated_measure.jl	0.00%	4 Missing ⚠️
src/samplers/mcmc/mcmc_sample.jl	42.85%	4 Missing ⚠️
... and 8 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #457      +/-   ##
==========================================
+ Coverage   48.56%   49.46%   +0.89%     
==========================================
  Files         118      121       +3     
  Lines        5553     5691     +138     
==========================================
+ Hits         2697     2815     +118     
- Misses       2856     2876      +20     

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