[Draft] Add dedicated code owners for codebase

[RissyRan]

Description

Add dedicated code owners for codebase for review.

Tests

Expect This CODEOWNERS file is valid check.

Checklist

Before submitting this PR, please make sure (put X in square brackets):

• [x] I have performed a self-review of my code.
• [x] I have necessary comments in my code, particularly in hard-to-understand areas.
• [x] I have run end-to-end tests tests and provided workload links above if applicable.
• [x] I have made or will make corresponding changes to the doc if needed.

[patemotter]

I have similar thoughts as above, the idea is reasonable, but in practice might cause more issues than it solves.

[RissyRan]

I have similar thoughts as above, the idea is reasonable, but in practice might cause more issues than it solves.

Yeah, let's see how it goes. It looks like vllm also has this in place. We could change it back if this does not work.

[vipannalla]

Talked offline, please add @jrplatin @patemotter @lumosis to inference rules as well.