ci: Add CODEOWNERS

[khvn26]

Thanks for submitting a PR! Please check the boxes below:

• [ ] I have run pre-commit to check linting
• [x] I have added information to docs/ if required so people know about the feature!
• [x] I have filled in the "Changes" section below?
• [x] I have filled in the "How did you test this code" section below?
• [x] I have used a Conventional Commit title for this Pull Request

Changes

Adds CODEOWNERS so reviewers hopefully get assigned automagically.

How did you test this code?

This is a CI change.

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3 Ignored Deployments

| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **docs** | ⬜️ Ignored ([Inspect](https://vercel.com/flagsmith/docs/2gWhcWUx8mykknkHThAaCBtt9L3T)) | | | Jun 21, 2024 2:01pm | | **flagsmith-frontend-preview** | ⬜️ Ignored ([Inspect](https://vercel.com/flagsmith/flagsmith-frontend-preview/6WaxTN7W1APfdLnzierLKDjnJwTT)) | | | Jun 21, 2024 2:01pm | | **flagsmith-frontend-staging** | ⬜️ Ignored ([Inspect](https://vercel.com/flagsmith/flagsmith-frontend-staging/9pDkxByLUEgbzP6iG7XLNRAaa8HD)) | | | Jun 21, 2024 2:01pm |

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