Add botorch_mfkg use-case.

[shuds13]

Works in batch. May need to update for async.

[codecov]

Codecov Report

❌ Patch coverage is 98.14815% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.85%. Comparing base (8c47657) to head (dae7ff5).
⚠️ Report is 48 commits behind head on develop.

Files with missing lines	Patch %	Lines
...semble/gen_funcs/persistent_botorch_mfkg_branin.py	97.80%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #1608       +/-   ##
============================================
+ Coverage    77.04%   91.85%   +14.80%     
============================================
  Files           79       81        +2     
  Lines         8325     8433      +108     
  Branches      1282     1290        +8     
============================================
+ Hits          6414     7746     +1332     
+ Misses        1666      483     -1183     
+ Partials       245      204       -41     

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