Add support for styles to botorch community PFN

[bletham]

Summary: Style tensors can be specified via a method override, and from there are correctly passed along in the call to the PFN torch model.

Differential Revision: D87847406

[meta-codesync]

@bletham has exported this pull request. If you are a Meta employee, you can view the originating Diff in D87847406.

[codecov]

Codecov Report

❌ Patch coverage is 88.23529% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 99.98%. Comparing base (8a6bc9e) to head (3bb99a4).

Files with missing lines	Patch %	Lines
botorch_community/models/prior_fitted_network.py	88.23%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3099      +/-   ##
==========================================
- Coverage   99.99%   99.98%   -0.01%     
==========================================
  Files         219      219              
  Lines       20887    20900      +13     
==========================================
+ Hits        20886    20897      +11     
- Misses          1        3       +2     

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