allow user to pass str for resource requests

[KPostOffice]

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What changes have been made

Allow users to use int or string when specifying resource requirements

Verification steps

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• Testing Strategy
  • Unit tests
  • Manual tests
  • Testing is not required for this change

[openshift-ci]

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[KPostOffice]

/hold

need to translate resources to RayCluster params

[openshift-merge-robot]

PR needs rebase.

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