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.

[dblock]

Permissions are incorrect. 19 people have maintain rights to this repo.

Please work with a

dmin to adjust.

[bbarani]

Added the users listed in MAINTAINERS.md file except for MaxKsyunz and Yury-Fridlyand as they are not part of the organization yet. Please update the MAINTAINERS.md with the updated list.

@anirudha @joshuali925 Please add CODEOWNERS file under .github directory with the maintainers list. CC: @dblock @CEHENKLE

[derek-ho]

This is done pending adding max and yury to github, which I have opened a ticket for

[dblock]

Verified, thx.