Add TorchAdapter.botorch_model property

[saitcakmak]

Summary: This is a convenience method that should save us from doing calls like client._generation_strategy.adapter.generator.surrogate.model and instead simplify it to client._generation_strategy.adapter.botorch_model.

Differential Revision: D91588495

[meta-codesync]

@saitcakmak has exported this pull request. If you are a Meta employee, you can view the originating Diff in D91588495.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.71%. Comparing base (1eb22a8) to head (2fb2161).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4827      +/-   ##
==========================================
- Coverage   96.71%   96.71%   -0.01%     
==========================================
  Files         586      586              
  Lines       61323    61342      +19     
==========================================
+ Hits        59309    59327      +18     
- Misses       2014     2015       +1     

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