Use fused types for _take_2d
Misc cleanup

For some of the cython code I get unexplained test failures when using fused types.  Vaguely hoping to narrow down the set of affected functions so as to make a helpful bug report to cython.
# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/22917?src=pr&el=h1) Report
> Merging [#22917](https://codecov.io/gh/pandas-dev/pandas/pull/22917?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/4976ee1c93bcc6327ca5e8714ad326c126f4151e?src=pr&el=desc) will **not change** coverage.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/22917/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/22917?src=pr&el=tree)

```diff
@@           Coverage Diff           @@
##           master   #22917   +/-   ##
=======================================
  Coverage   92.19%   92.19%           
=======================================
  Files         169      169           
  Lines       50831    50831           
=======================================
  Hits        46864    46864           
  Misses       3967     3967
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.61% <ø> (ø)` | :arrow_up: |
| #single | `42.35% <ø> (ø)` | :arrow_up: |


------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/22917?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/22917?src=pr&el=footer). Last update [4976ee1...849a6ce](https://codecov.io/gh/pandas-dev/pandas/pull/22917?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 rebase. I assume you want to merge this, or was this just testing things? > rebase. I assume you want to merge this

Done and yes
 thanks!