c10::optional -> std::optional

[r-barnes]

Since Nov 29, 2023, PyTorch's c10::optional has been an alias for std::optional (link).

As of Dec 17, 2024, PyTorch has begun taking steps to begin removing the c10::optional alias entirely (link). The old API remains available, for now, but you can check whether your code has eliminated all instances of deprecated APIs by compiling with C10_NODEPRECATED defined as a preprocessor flag (-DC10_NODEPRECATED).

This PR converts your existing usages of c10::optional to std::optional (same for nullopt).

(Additional deprecated APIs include C10_UNUSED, C10_NODISCARD, and c10::string_view.)

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.09%. Comparing base (2d55981) to head (c4a651f).
Report is 5 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #394   +/-   ##
=======================================
  Coverage   73.09%   73.09%           
=======================================
  Files          29       29           
  Lines        1171     1171           
=======================================
  Hits          856      856           
  Misses        315      315           

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