Add Nicolas Belouin (@diconico07) to CODEOWNERS

[diconico07]

What this PR does / why we need it:
Add myself (Nicolas Belouin) as maintainer for akri.

Special notes for your reviewer:
This requires giving write access to the repository before merge

If applicable:

• this PR has an associated PR with documentation in akri-docs
• this PR contains unit tests
• added code adheres to standard Rust formatting (cargo fmt)
• code builds properly (cargo build)
• code is free of common mistakes (cargo clippy)
• all Akri tests succeed (cargo test)
• inline documentation builds (cargo doc)
• all commits pass the DCO bot check by being signed off -- see the failing DCO check for instructions on how to retroactively sign commits

[kate-goldenring]

Thanks for all the contributions you've already made @diconico07! Excited for you to join the maintainer team! 🥳

[adithyaj]

Welcome aboard!😄

[kate-goldenring]

@diconico07 can you merge/rebase and then we can officially merge 🎉