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.

[stephen-crawford]

All set!

[dblock]

You had the security group with 7 members and all your maintainers had Admin level access. I've removed the group and downgraded everyone to maintain.

[peternied]

I've reviewed the list, there was a security triage group, but not the OpenSearch triage group. I've added the correct project groups.

There is a bot user opendistroforelasticsearch-security that I'm double checking it access. Once it is clear what this account is for and its been given the appropriate access I'll close out this issue.

[peternied]

All access setting have been baselined

[dblock]

Verified, thanks.