add support for general box bounds to RandomGenerators.

[bletham]

Summary:
Currently RandomGenerators require that the space be mapped to [0, 1]^d, for the convenience of random number generators operating on that space by default. In a stacked diff I would like to super() gen on a random generator but need the returned points to be in raw space, no UnitX transformation.

It is a relatively small change for RandomGenerators to be capable of operating with arbitrary bounds, which change this diff makes.

Differential Revision: D94118103

[meta-codesync]

@bletham has exported this pull request. If you are a Meta employee, you can view the originating Diff in D94118103.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.80%. Comparing base (cf057df) to head (ef675eb).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4932   +/-   ##
=======================================
  Coverage   96.80%   96.80%           
=======================================
  Files         595      595           
  Lines       63160    63167    +7     
=======================================
+ Hits        61141    61148    +7     
  Misses       2019     2019           

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