CLN: pandas/_libs/tslibs/nattype.pyx
- [ ] closes #xxxx
- [ ] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

---

This PR is doing basicly two things:

* Getting rid of ```noqa: E128``` comments.

* Unifying use of```util.foo```

in some places there was a use of  ```is_integer_object(foo)``` and in some places there was a use of ```util.is_integer_object(foo)```, now ```util.is_integer_object(foo)``` is being in use instead.

---

Benchmarks:

```
In [1]: from pandas._libs.tslibs.nattype import _make_nat_func 

In [2]: %timeit _make_nat_func("foo", "bar")
120 ns ± 1.01 ns per loop (mean ± std. dev. of 7 runs, 10000000 loops each) # Master
117 ns ± 1.47 ns per loop (mean ± std. dev. of 7 runs, 10000000 loops each) # PR
```