BUG: DataFrame.asof() : Timezone Awareness / Naivety comparison TypeError
- [X] closes #21194 
- [X] tests added / passed
- [X] whatsnew entry

# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/22198?src=pr&el=h1) Report
> :exclamation: No coverage uploaded for pull request base (`master@0850fbd`). [Click here to learn what that means](https://docs.codecov.io/docs/error-reference#section-missing-base-commit).
> The diff coverage is `100%`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/22198/graphs/tree.svg?width=650&height=150&token=eZ4WkYLtcO&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/22198?src=pr&el=tree)

```diff
@@            Coverage Diff            @@
##             master   #22198   +/-   ##
=========================================
  Coverage          ?   92.06%           
=========================================
  Files             ?      169           
  Lines             ?    50694           
  Branches          ?        0           
=========================================
  Hits              ?    46671           
  Misses            ?     4023           
  Partials          ?        0
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.47% <100%> (?)` | |
| #single | `42.32% <0%> (?)` | |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/22198?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/core/indexes/base.py](https://codecov.io/gh/pandas-dev/pandas/pull/22198/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9iYXNlLnB5) | `96.37% <100%> (ø)` | |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/22198?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/22198?src=pr&el=footer). Last update [0850fbd...71f9f56](https://codecov.io/gh/pandas-dev/pandas/pull/22198?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 @jreback @mroeschke Can you have a look?  This looks ready to merge. thanks @msmarchena  Thanks to all of you.  and sorry for the mess, it was my first PR ;-)