implement tslibs.arraylike
- [ ] closes #xxxx
- [ ] tests added / passed
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/21700?src=pr&el=h1) Report
> Merging [#21700](https://codecov.io/gh/pandas-dev/pandas/pull/21700?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/ad76ffcca0d92c3885c279c80701c2f4a3f3f177?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/21700/graphs/tree.svg?width=650&height=150&src=pr&token=eZ4WkYLtcO)](https://codecov.io/gh/pandas-dev/pandas/pull/21700?src=pr&el=tree)

```diff
@@           Coverage Diff           @@
##           master   #21700   +/-   ##
=======================================
  Coverage    91.9%    91.9%           
=======================================
  Files         154      154           
  Lines       49659    49659           
=======================================
  Hits        45640    45640           
  Misses       4019     4019
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.28% <ø> (ø)` | :arrow_up: |
| #single | `41.89% <ø> (ø)` | :arrow_up: |


------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/21700?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/21700?src=pr&el=footer). Last update [ad76ffc...6248438](https://codecov.io/gh/pandas-dev/pandas/pull/21700?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 Part of this PR is superseded by #21721.  The other part is in limbo.  Closing to clear the queue. Woops, closed the wrong one. Closing as non-actionable for now