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.

[bbarani]

Added the users listed in MAINTAINERS.md file as maintainers of this repo except for @harold-wang as he is not part of this organization. @anirudha @joshuali925 Please update the MAINTAINERS.md and add CODEOWNERS file under .github directory with the maintainers list. CC: @dblock @CEHENKLE

[derek-ho]

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

[dblock]

Verified, thx.