Annotate commonly used param decorators

[gandhis1]

See holoviz/panel#7078 for more details

The highest ROI public interface typing improvements tend to be decorators as untyped decorators basically nuke the user's own type information, thus undermining static analysis checks in their own code.

List of decorators:

• param.depends
• param.parametrized.output
• param.parameterized.iscoroutinefunction (needs to be a TypeGuard just like the inspect variant)
• Any others that are widely used?

FYI @MarcSkovMadsen