Suspend/Resume feature on SparkApplication

[everpeace]

Purpose of this PR

This PR implements Suspend/Resume operation on SparkApplication.

Proposed changes:

• Add Suspend: true|false field in SparkApplicationSpec
• State Transition:
  • Suspend: ** --Suspend: true--> SUSPENDING --> SUSPENDED (**=any non-Terminal Application State)
  • Resume: SUSPENDING | SUSPENDED --Suspend: false--> RESUMING --> SUBMITTED

Fixes #2290

Change Category

• Bugfix (non-breaking change which fixes an issue)
• Feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that could affect existing functionality)
• Documentation update

Rationale

Supporting Suspend/Resume feature could make Kueue integration easier.

Checklist

• I have conducted a self-review of my own code.
• I have updated documentation accordingly.
• I have added tests that prove my changes are effective or that my feature works.
• Existing unit tests pass locally with my changes.

Additional Notes

[google-oss-prow]

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