Updated MAINTAINERS.md format.

[dblock]

Coming from opensearch-project/.github#121, updated MAINTAINERS.md to match opensearch-project recommended format.

[peternied]

We have repo specific responsibilities in this document, should they be here or is there a project-wide practice for this elsewhere?

[peternied]

Thanks @dblock !

[codecov-commenter]

Codecov Report

Merging #2376 (ac7d717) into main (67e4176) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main    #2376      +/-   ##
============================================
- Coverage     61.09%   61.04%   -0.05%     
+ Complexity     3271     3266       -5     
============================================
  Files           260      260              
  Lines         18363    18363              
  Branches       3250     3250              
============================================
- Hits          11219    11210       -9     
- Misses         5559     5563       +4     
- Partials       1585     1590       +5     

Impacted Files	Coverage Δ
...urity/ssl/transport/SecuritySSLNettyTransport.java	62.36% <0.00%> (-4.31%)	⬇️
...earch/security/ssl/util/SSLConnectionTestUtil.java	93.18% <0.00%> (-2.28%)	⬇️
.../dlic/auth/ldap2/LDAPConnectionFactoryFactory.java	57.46% <0.00%> (-1.50%)	⬇️
...ensearch/security/compliance/ComplianceConfig.java	82.63% <0.00%> (-0.70%)	⬇️

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