Refactor cmake Selective Build Option ROOT_OPS

[BujSet]

🚀 The feature, motivation and pitch

ROOT_OPS is a bit of a misnomer for what this option actually represents. We see in test_selective_build.sh the ROOT_OPS option to the gen_selected_ops macro is intended to be used to pass a list of operators for selective build. This should probably be renamed to something like OPS_LIST or SELECT_OPS_FROM_LIST.

Some places in the code that would need this refactor:

• tools/cmake/Codegen.cmake
• codegen/tools/gen_oplist.py
• examples/selective_build/CMakeLists.txt

There are likely other places that need changes, but these would be some good places to start.

Alternatives

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Additional context

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RFC (Optional)

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cc @mergennachin @byjlw @iseeyuan @lucylq @helunwencser @tarun292 @kimishpatel @jackzhxng

[BujSet]

cc @lucylq @JacobSzwejbka Just creating an issue for this so we don't forget it as a future TODO. Do you think this issue would be a good candidate for the "good first issue" label?