feat: adding more type annotations

[gvwilson]

This PR will address #3226. Using pyright --pythonversion 3.9 ./dash to check.

[gvwilson]

The warning in dash/table/__init__.py can be fixed by changing the imports at the top from:

from ._imports_ import *  # noqa: E402, F401, F403
from ._imports_ import __all__ as _components
from . import Format  # noqa: F401, E402
from . import FormatTemplate  # noqa: F401, E402

to:

from . import DataTable  # noqa: F401, E402
from . import Format  # noqa: F401, E402
from . import FormatTemplate  # noqa: F401, E402

However, this file is generated during npm run build, so we need to figure out where and how to modify the generator.

[T4rk1n]

multiprocess is an extra dependencies, due to how we load everything in the dash.__init__ it would be imported in environment that hasn't installed it. Need to move back into the function call.

This library also has unparsable code so the typing/linting can't find the member and need this line back:

# pylint: disable-next=import-outside-toplevel,no-name-in-module,import-error

[T4rk1n]

💃

[mayankg90]

This is not present in flask 1.1.1 and requirements are set to 1.0.4

Flask only has typing after 2.0.0

[anurag1paul]

RouteCallable in flask.typing was added by PR pallets/flask#4676 which was released in flask 2.2.0 https://github.com/pallets/flask/commits/2.2.0?after=b17bb9ed563ab2857c0db9a07ec4e6407404c7be+34, so probably need to update requirements to >= 2.2.0