Add basic TD framework (#106997)
Adds a new structure to house all heuristics we use for Target Determination and Test Reordering. I'm keeping it somewhat minimal for now, to let it evolve more easily as we try new things.
It currently does nothing. The 2nd pr in the stack ports the existing heuristics to actually use this new framework
Pull Request resolved: https://github.com/pytorch/pytorch/pull/106997
Approved by: https://github.com/clee2000, https://github.com/huydhn
