Is your feature request related to a problem? Please describe.
As a followup of #5823 and #5657 a next step could be to fill out type annotations for any function that already has at least one type annotation.

Describe the solution you'd like
Fully type annotate parameters and return types for functions that have at least one type annotation.
This can also be enforced by the mypy config disallow_incomplete_defs = True.
Should not be done in one big PR, but in smaller PRs (maybe for each module or less).

Describe alternatives you've considered
Maybe first get https://mypy.readthedocs.io/en/stable/config_file.html#confval-disallow_untyped_defs to pass, so for each function you would only need at least one type annotation.

Additional context

• mypy documentation: https://mypy.readthedocs.io/en/stable/config_file.html#confval-disallow_incomplete_defs

Finished Modules:

• _extensions
• apps
• auto3dseg
• bundle
• config
• data
• engines
• fl
• handlers
• inferers
• losses
• metrics
• networks
• optimizers
• transforms
• utils
• visualize