DGS-22434 Add support for recursive mode delete

[karthikeyanas]

What

Add support for recursive mode delete /mode API. This add a new options parameter recursive, which when set to true and subject is a context, will update mode for the given context and all subjects under the context.
This is defaulted to false to maintain existing behavior

Checklist

Please answer the questions with Y, N or N/A if not applicable.

• [Y] Contains customer facing changes? Including API/behavior changes
• [N] Is this change gated behind config(s)?
  • List the config(s) needed to be set to enable this change
• [Y] Did you add sufficient unit test and/or integration test coverage for this PR?
  • If not, please explain why it is not required
• [N] Does this change require modifying existing system tests or adding new system tests?
  • If so, include tracking information for the system test changes
• [N] Must this be released together with other change(s), either in this repo or another one?
  • If so, please include the link(s) to the changes that must be released together

References

JIRA: https://confluentinc.atlassian.net/browse/DGS-22434

Test & Review

• Unit tests
• Manual tests in local SR

[confluent-cla-assistant]

🎉 All Contributor License Agreements have been signed. Ready to merge.
_{Please push an empty commit if you would like to re-run the checks to verify CLA status for all contributors.}

[rayokota]

Thanks @karthikeyanas , one last nit

[sonarqube-confluent]

Quality Gate passed

Issues
14 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
83.1% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube