Update CODEOWNERS with more specific code owners

[Swiddis]

Description

Coming from #1252, this PR updates codeowners to:

• Include less owners overall, to get more focused reviews.
• Adds dedicated owners for the major subcomponents.

Issues Resolved

Closes #1252.

Check List

• New functionality includes testing.
  • All tests pass, including unit test, integration test and doctest
• New functionality has been documented.
  • New functionality has javadoc added
  • New functionality has user manual doc added
• 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.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.62%. Comparing base (bccdc31) to head (cd87d01).
Report is 19 commits behind head on main.

❗ Current head cd87d01 differs from pull request most recent head 33a9523. Consider uploading reports for the commit 33a9523 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1256      +/-   ##
==========================================
- Coverage   57.61%   56.62%   -0.99%     
==========================================
  Files         368      348      -20     
  Lines       13915    12656    -1259     
  Branches     3650     3202     -448     
==========================================
- Hits         8017     7167     -850     
+ Misses       5835     5436     -399     
+ Partials       63       53      -10     

Flag	Coverage Δ
dashboards-observability	56.62% <ø> (-0.99%)	⬇️

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[ps48]

I propose adding the code-owners as below:
Logs explorer: @mengweieric
panels: @pjfitzgibbons
app analytics: @paulstn
notebooks: @ps48
metrics: @kavithacm
trace analytics: @RyanL1997
Integrations: @Swiddis
Datasources: @RyanL1997

[kavithacm]

Can you add Ryan as a maintainer before merging this PR?

[derek-ho]

@Swiddis can we reach out to @pjfitzgibbons to see if he wants to be moved to emeritus prior to merging?