Deprecate passing args as positional in DataFrame/Series.interpolate

[MarcoGorelli]

• xref Deprecate non-keyword arguments for methods with inplace #41485
• tests added / passed
• Ensure all linting tests pass, see here for how to run them
• whatsnew entry

[simonjayhawkins]

I would have expected this to raise a TypeError.

[simonjayhawkins]

message doesn't need to mention self

[jorisvandenbossche]

Maybe allow method to be positional?

[jreback]

can you rebase

[jreback]

thanks @MarcoGorelli

[jreback]

@MarcoGorelli if you wouldn't mind adding these to the deprecations list see #30228 (I added this one).

also after these are 'done', it may make sense to make a separate deprecation section and/or normalize the language for these in the whatsnew.

[simonjayhawkins]

if deprecate_nonkeyword_arguments is updated to accept a class argument then maybe could do something like

    interpolate = deprecate_nonkeyword_arguments(
        version=None, allowed_args=["self", "method"], class="DataFrame"
    )(NDFrame.interpolate)

[MarcoGorelli]

will do - and yes, once they're in I'll sort out the whatsnew entry