Baseline CODEOWNERS and MAINTAINERS with current team

[dbwiddis]

Description

Updates MAINTAINERS with current team and moves prior maintainers to Emeritus status. Aligns with CodeOwners

Issues Resolved

Fixes #316

Check List

• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[joshpalis]

@dbwiddis Seems like neural search is causing 2.7.0 opensearch distribution build failures, I'll loop back around to restart the failed checks once the build succeeds

[codecov-commenter]

Codecov Report

Merging #355 (a95ede1) into main (cf6c78e) will increase coverage by 0.09%.
The diff coverage is 0.00%.

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@@             Coverage Diff              @@
##               main     #355      +/-   ##
============================================
+ Coverage     28.84%   28.94%   +0.09%     
  Complexity       97       97              
============================================
  Files            23       22       -1     
  Lines          1182     1178       -4     
  Branches        109      109              
============================================
  Hits            341      341              
+ Misses          820      816       -4     
  Partials         21       21              

Impacted Files	Coverage Δ
...r/transport/request/ExtensionJobActionRequest.java	0.00% <0.00%> (ø)
...heduler/transport/request/JobParameterRequest.java	0.00% <0.00%> (ø)
...bscheduler/transport/request/JobRunnerRequest.java	0.00% <0.00%> (ø)
...duler/transport/response/JobParameterResponse.java	0.00% <ø> (ø)
...cheduler/transport/response/JobRunnerResponse.java	0.00% <ø> (ø)

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[opensearch-trigger-bot]

The backport to 2.x failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-2.x 2.x
# Navigate to the new working tree
cd .worktrees/backport-2.x
# Create a new branch
git switch --create backport/backport-355-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 8eecad00d265430c2a30aa1e5c53e2104f5c9075
# Push it to GitHub
git push --set-upstream origin backport/backport-355-to-2.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-355-to-2.x.

[dblock]

Verified, thanks.