Baseline MAINTAINERS, CODEOWNERS, and external collaborator permissions

[dblock]

Follow opensearch-project/.github#125 to baseline MAINTAINERS, CODEOWNERS, and external collaborator permissions.

Close this issue when:

1. MAINTAINERS.md has the correct list of project maintainers.
2. CODEOWNERS exists and has the correct list of aliases.
3. Repo permissions only contain individual aliases as collaborators with maintain rights, admin, and triage teams.
4. All other teams are removed from repo permissions.

If this repo's permissions was already baselined, please confirm the above when closing this issue.

[sumobrian]

Check list items from opensearch-project/.github#125 have been completed.

[dblock]

Permissions are incorrect. Please work with @bbarani's team to remove the group and add individuals with maintain access.

[bbarani]

Fixed the permissions so closing this issue.

[dblock]

Verified, thx.