API: add `NaTType` and `NAType` to `pandas.api.typing`
- [x] Closes #53934
- [x] *I assume that no tests are needed for this*
- [ ] All [code checks passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit)
- [x] *I assume that no changelog entry is needed for this*

Thanks @Charlie-XIAO 