Replace the legacy ResourceSet & SchedulingResources at Raylet

[Chong-Li]

Why are these changes needed?

This PR tries to replace the legacy ResourceSet and SchedulingResources (by ResourceRequest and NodeResources respectively) structures at Raylet.

Related issue number

#22854

Checks

• I've run scripts/format.sh to lint the changes in this PR.
• I've included any doc changes needed for https://docs.ray.io/en/master/.
• I've made sure the tests are passing. Note that there might be a few flaky tests, see the recent failures at https://flakey-tests.ray.io/
• Testing Strategy
  • Unit tests
  • Release tests
  • This PR is not tested :(

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[raulchen]

LGTM, except the issue @wumuzi520 mentioned.
Also, is "ResourceSet" still used after this PR? If no, can we also remove it?

[Chong-Li]

LGTM, except the issue @wumuzi520 mentioned. Also, is "ResourceSet" still used after this PR? If no, can we also remove it?

There are some left in task_spec. Should it be solved here or leave it when you rename the ResourceRequest to ResourceSet (which is also a TDOO item)? @raulchen I'm ok with either way~

[wumuzi520]

LGTM

[scv119]

Thanks for cleaning it up!