Add DLS team to CODEOWNERS

[mathew-cf]

Summary

Screenshots (optional)

Documentation checklist

• Is there a changelog entry (guidelines)? If you don't add one for something awesome and new (however small) — how will our customers find out? Changelogs are automatically posted to RSS feeds, the Discord, and X.
• The change adheres to the documentation style guide.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

[mathew-cf]

cc @njones-cf @mathew-cf @aberglund-cf @cferike @cagrawal @Arkanayan @connect-avinash31 @umeshgtank