fix: convert wandb metadata

[Zeyi-Lin]

This pull request includes updates to the README files in multiple languages and a minor change in the wb_converter.py file. The changes primarily focus on adding new features and integrations, as well as improving documentation consistency.

Documentation Updates:

• Added MLFlow integration in README.md, README_EN.md, README_JP.md, and README_RU.md to support converting MLFlow experiments to SwanLab experiments. [1] [2] [3] [4]
• Moved the entry for the cloud version project table optimization to the detailed changelog section in README.md, README_EN.md, README_JP.md, and README_RU.md for better organization. [1] [2] [3] [4]
• Updated the list of integrated frameworks to include MLFlow in README.md, README_EN.md, README_JP.md, and README_RU.md. [1] [2] [3] [4]

Code Update:

• Modified the parse_wandb_logs method in wb_converter.py to use a more descriptive mode parameter and corrected the metadata assignment.