[tune] Add option to keep random values constant over grid search #16501
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Why are these changes needed?
This introduces a new option to the BasicVariantGenerator to allow us to sample random variables before applying grid search. This will keep random variables constant across grid search categories.
Also cc @Yard1 who might be working on this code soon.
Related issue number
Closes #15126
See https://discuss.ray.io/t/tune-feature-request-using-ray-tune-for-k-fold-with-repeated-grid-sampling/2541
Checks
scripts/format.sh
to lint the changes in this PR.