Type schema attribute as Any

[cdce8p]

Schemable is great as parameter type. However, without a dedicated type annotation mypy will also use it as argument type for Schema.schema and Marker.schema which just creates unhelpful errors when used

error: Unsupported right operand type for in ("Schema | Object | Mapping[Any, Any] |
    list[Any] | tuple[Any, ...] | <12 more items> | None")  [operator]
error: Item "Schema" of "Schema | Object | Mapping[Any, Any] | list[Any] | tuple[Any, ...] |
    <12 more items> | None" has no attribute "items"  [union-attr]

Typing it as Any will "disable" type checking when using the schema attribute, while still providing the type safety for the parameter type.

An alternative would have been #520. However that comes with its own set of issues as now all Schemas are generic and need additional type annotations.

Refs home-assistant/core#120268

[alecthomas]

Thanks!