Enhancement/9955 post meta settings class

[ankitrox]

Summary

Addresses issue:

• Add post meta setting to store post-level RRM settings #9955

Relevant technical choices

PR Author Checklist

• My code is tested and passes existing unit tests.
• My code has an appropriate set of unit tests which all pass.
• My code is backward-compatible with WordPress 5.2 and PHP 7.4.
• My code follows the WordPress coding standards.
• My code has proper inline documentation.
• I have added a QA Brief on the issue linked above.
• I have signed the Contributor License Agreement (see https://cla.developers.google.com/).

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Code Reviewer Checklist

• Run the code.
• Ensure the acceptance criteria are satisfied.
• Reassess the implementation with the IB.
• Ensure no unrelated changes are included.
• Ensure CI checks pass.
• Check Storybook where applicable.
• Ensure there is a QA Brief.
• Ensure there are no unexpected significant changes to file sizes.

Merge Reviewer Checklist

• Ensure the PR has the correct target branch.
• Double-check that the PR is okay to be merged.
• Ensure the corresponding issue has a ZenHub release assigned.
• Add a changelog message to the issue.

[github-actions]

Build files for 53437b8 have been deleted.

[github-actions]

Size Change: +42 B (0%)

Total Size: 1.99 MB

Filename	Size	Change
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./dist/assets/js/googlesitekit-entity-dashboard-********************.js	81.4 kB	+25 B (+0.03%)
./dist/assets/js/googlesitekit-main-dashboard-********************.js	166 kB	+10 B (+0.01%)
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./dist/assets/js/googlesitekit-modules-search-console-********************.js	69.1 kB	-2 B (0%)

ℹ️ View Unchanged

Filename	Size
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[nfmohit]

Thank you for your work on this, @ankitrox!

I've added a few very minor nitpicky comments for you to review. Besides, could you also update the branch and resolve commits?

Please let me know if you have any questions, thank you!

[ankitrox]

Thanks for reviewing the PR @nfmohit and adding the feedback.

I've addressed the feedback comments and sending it your way to further review the changes.

Thanks again!

[nfmohit]

Thanks for the updates, nice work, LGTM ✅

Note: I've verified that the failing E2E tests in CI are unrelated to the PR.