Fix 'rtol' and 'atol' for numeric extension types
- [ ] closes #xxxx
- [x] tests added / passed
- [ ] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit) for how to run them
- [ ] whatsnew entry

cc @stefansorgqc
> does this have an associated issue / bug report?

No, shall I create one? thanks @jonashaag 