feat: Add NGINX Gateway Fabric to CODEOWNERS, alphabetize file

[ADubhlaoich]

Proposed changes

This commit adds the NGINX Gateway Fabric team as codeowners of the NGF subfolders related to the product, ensuring they get tagged when relevant. As part of this change, I have also alphabetized the teams and adjusting the spacing for readability.

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[ADubhlaoich]

The CODEOWNERS file issue confirms something I've suspected: the product teams' permissions haven't been set up correctly.

Flagged it to engineering - the teams weren't being tagged for PRs.