use parse_quantity to convert string to raw resource

[KPostOffice]

Issue link

RHOAIENG-5000

What changes have been made

Directly use mem string with units rather than attempting to convert back and forth to int. If the actual number of bytes used by a cluster is needed for some reason in the future, use kubernetes.utils.parse_quantity

Verification steps

Checks

• I've made sure the tests are passing.
• Testing Strategy
  • Unit tests
  • Manual tests
  • Testing is not required for this change

[abhijeet-dhumal]

/lgtm
Manually verified, using demo notebook.

Reproducer :
In current upstream version, Using '500m' as a string value in ClusterConfiguration and by running

from codeflare_sdk.cluster import get_cluster
get_cluster(<raycluster_name>,<namespace_name>)

ValueError: invalid literal for int() with base 10: '500m'

This PR resolved above error by accepting string value as input to ClusterConfiguration parameters.

[openshift-ci]

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This pull-request has been approved by: abhijeet-dhumal
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