Demonstrate usage of createAsyncUpdater to conditionally reveal main menu item

[cwperks]

Description

This PR shows the dashboards-reporting plugin using the security-dashboard-plugin's (if installed) to call checkHasApiPermission and return the result. If true the logged user can see Reporting on the main menu and if false then its hidden. FYI a security admin user is someone with roles defined in the cluster setting plugins.security.restapi.roles_enabled: ["all_access", "security_rest_api_access"].

Note: This is a contrived example and not meant to be merged. The intended consumer would be a new dashboards-job-scheduler plugin: opensearch-project/.github#393

Issues Resolved

Related to opensearch-project/security#5635, but limited in scope to hiding/revealing a menu item only if the logged in user is a security admin.

Check List

• New functionality includes testing.
  • All tests pass, including unit test, integration test and doctest
• New functionality has been documented.
  • New functionality has javadoc added
  • New functionality has user manual doc added
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.