Inject constructed arguments schema into view method

Nobody has claimed this yet.

Using this example from the documentation:
```
@blp.arguments(PetQueryArgsSchema, location="query")
```
The `arguments` decorator will make sure the results of the PetQueryArgsSchema are injected into the wrapped view method, but the schema object is thrown away once finished with.

It would be very useful to also optionally inject the constructed schema object as well, since I have quite a few schemas that set internal context that is required in subsequent processing.

Marshmallow schemas have a similar thing when doing their own `@post_dump` etc decorators where you can use `pass_orig` to get at the original data before the schema processed it. I suggest we have a `pass_schema` to add an extra `schema=` kwarg to the wrapped method.

It's possible that this needs to happen in the webargs `use_args` function and not here, but I thought I'd gather opinions on this enhancement before attempting a fix myself.

Start by tracing the blp.arguments decorator into the webargs use_args function, as the issue suggests; no specific repository files or tests are named. Determine how an optional pass_schema setting could expose the constructed schema while preserving current injection behavior, then verify the existing arguments flow and add coverage for the new option.

Written by the indexing model from the issue text.