Heterogeneous search space utils

[hvarfner]

Differential Revision: D90647950

[meta-codesync]

@hvarfner has exported this pull request. If you are a Meta employee, you can view the originating Diff in D90647950.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 33.33333% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.78%. Comparing base (190ffb2) to head (2da21f4).

Files with missing lines	Patch %	Lines
ax/benchmark/benchmark_test_functions/surrogate.py	33.33%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4767      +/-   ##
==========================================
- Coverage   96.80%   96.78%   -0.02%     
==========================================
  Files         595      595              
  Lines       63094    63112      +18     
==========================================
+ Hits        61079    61084       +5     
- Misses       2015     2028      +13     

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