chore: added CODEOWNERS file to enable branch protection policy (REV-3441)

[ishahroz]

Anyone merging to this repository is expected to release and monitor their changes; if you are not able to do this DO NOT MERGE, please coordinate with someone who can to ensure that the changes are released.

Description

Describe what this pull request changes, and why these changes were made. How will these changes affect other people, installations of edx, etc.?
Please include links to any relevant ADRs, design artifacts, and decision documents. Make sure to document the rationale behind significant changes in the repo, per OEP-19, and can be
linked here.

Useful information to include:

• Which edX user roles will this change impact? Common user roles are "Learner", "Course Author", "Developer", and "Operator".
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Testing instructions

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Other information

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[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +11.91% 🎉

Comparison is base (938d3e1) 50.00% compared to head (4ac8082) 61.91%.
Report is 20 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #283       +/-   ##
===========================================
+ Coverage   50.00%   61.91%   +11.91%     
===========================================
  Files          15       34       +19     
  Lines         164      323      +159     
  Branches       28       68       +40     
===========================================
+ Hits           82      200      +118     
- Misses         77      117       +40     
- Partials        5        6        +1     

see 33 files with indirect coverage changes

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