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 80.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 96.72%. Comparing base (2d69d98) to head (d8b461c).

Files with missing lines	Patch %	Lines
ax/benchmark/benchmark_test_functions/surrogate.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4767   +/-   ##
=======================================
  Coverage   96.72%   96.72%           
=======================================
  Files         582      582           
  Lines       60800    60805    +5     
=======================================
+ Hits        58810    58815    +5     
  Misses       1990     1990           

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