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.

[scrawfor99]

Taking over for @DarshitChanpura since I talked to Chang about maintainership already.

[scrawfor99]

All set!

[dblock]

You have the plugins with 8 members, and security with 7 members that have admin access to this repo. Only folks listed in MAINTAINERS/CODEOWNERS need to have maintain access, and groups don't support external collaborators and therefore should be removed. Please work with an admin to remove the group, and add individuals.

[peternied]

I've reviewed and resolved all the outstanding permissions associated with this repo.

[dblock]

Verified, thanks.