Updated the MAINTAINERS doc. and the CODEOWNERS doc.

[Angie-Zhang]

Description

Updated the MAINTAINERS doc. and the CODEOWNERS doc.

Issues Resolved

#610

Check List

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[codecov-commenter]

Codecov Report

Merging #612 (377a109) into main (f5fed5f) will not change coverage.
The diff coverage is n/a.

❗ Current head 377a109 differs from pull request most recent head 075ccdf. Consider uploading reports for the commit 075ccdf to get more accurate results

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@@           Coverage Diff           @@
##             main     #612   +/-   ##
=======================================
  Coverage   59.67%   59.67%           
=======================================
  Files         268      268           
  Lines        8863     8863           
  Branches     1618     1618           
=======================================
  Hits         5289     5289           
  Misses       3180     3180           
  Partials      394      394           

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[AWSHurneyt]

For context, this issue discusses the @opensearch-project/opensearch@2.1.0: The engine "yarn" is incompatible with this module. Expected version "^1.22.10". Got "1.21.1" error reported in the failing test workflow. Looks like it's still being discussed.
opensearch-project/opensearch-build#3210

The changes in this PR are not causing the failure though, so approving.