feat: add custom actions for Numaflow CRDs

[dpadhiar]

Add custom actions to pause/unpause Numaflow CRDs Pipelines and MonoVertices

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
• The title of the PR states what changed and the related issues number (used for the release note).
• The title of the PR conforms to the Toolchain Guide
• I've included "Closes [ISSUE #]" or "Fixes [ISSUE #]" in the description to automatically close the associated issue.
• I've updated both the CLI and UI to expose my feature, or I plan to submit a second PR with them.
• Does this PR require documentation updates?
• I've updated documentation as required by this PR.
• I have signed off all my commits as required by DCO
• I have written unit and/or e2e tests for my change. PRs without these are unlikely to be merged.
• My build is green (troubleshooting builds).
• My new feature complies with the feature status guidelines.
• I have added a brief description of why this PR is necessary and/or what this PR solves.
• Optional. My organization is added to USERS.md.
• Optional. For bug fixes, I've indicated what older releases this fix should be cherry-picked into (this may or may not happen depending on risk/complexity).

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.00%. Comparing base (47f63f0) to head (2a2ff64).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #20332   +/-   ##
=======================================
  Coverage   55.99%   56.00%           
=======================================
  Files         322      322           
  Lines       44717    44717           
=======================================
+ Hits        25040    25044    +4     
+ Misses      17083    17072   -11     
- Partials     2594     2601    +7     

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