Deprecate passing args as positional in DataFrame/Series.interpolate
- [ ] xref #41485
- [ ] tests added / passed
- [ ] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them
- [ ] whatsnew entry

Maybe allow `method` to be positional? can you rebase thanks @MarcoGorelli  @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. will do - and yes, once they're in I'll sort out the whatsnew entry