Add MLflow to the "Developer tools" section

[B-Step62]

trafficstars

Hi @steven2358, I really appreciate the time and effort you've put into building and maintaining such a comprehensive list!

I’d like to contribute by adding MLflow to the "Developer tools" category. It offers a range of LLMOps capabilities, including prompt tracking, evaluation, tracing, and more, and has been widely adopted (with 19K stars). Please let me know if there's a more suitable category for it.