Add share button when resource sharing is enabled

[cwperks]

Description

Companion PRs:

• [Resource Sharing] Get instances by instances explicitly shared, or instances from report definitions explicitly shared reporting#1
• Add general_access field on sharing doc to store a single access level for general access opensearch-project/security#6033

This PR adds share buttons in dashboards-reporting repo to make sharing easy for report definitions and report instances.

Currently, in order to share it requires plugins.alerting.filter_by_backend_roles to be set to true and has no API to change sharing. When plugins.alerting.filter_by_backend_roles is set to true a report is "shared" with userB if userB shares a backend role with userA, the creator of the report.

Sharing Modal:

Share Button:

Note: this PR adds the sharing modal in this repo initially, but plans would be ultimately to make this re-usable across the project.

Note 2: Currently a user must type out a target username or target role explicitly. There is another plan to make these typeaheads.

Roles would be trivial as those are roles stored within OpenSearch.

Username for internalusers would be quick to support, but full report requires: opensearch-project/security-dashboards-plugin#2285

Issues Resolved

Related to: opensearch-project/security#4500

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

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