fix WandbLoggerConfig include additional kwargs in pydantic schema - #3469

The Weights and Biases logger accepts a variety of extra arguments, such as notes, tags, etc. These were mediated through wandb_kwargs which could be defined at top-level. However since the introduction of the stricter pydantic schemas these top-level arguments with extra="forbid" would raise a ValidationError.

This PR:

• fixes a dead wandb_kwargs field in the WandBloggerConfig (was never passed correctly to the logger)
• adds common top-level fields such as notes, tags, group to the top-level config.