MAINT: Drop order and sort from pandas objects
Affected classes:

1) `Index`
2) `Series`
2) `DataFrame`

xref #10726
# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/15735?src=pr&el=h1) Report
> Merging [#15735](https://codecov.io/gh/pandas-dev/pandas/pull/15735?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/59b88ab6123338e1dfcc0f77dfb3e5c4c511889a?src=pr&el=desc) will **decrease** coverage by `0.01%`.
> The diff coverage is `n/a`.


```diff
@@            Coverage Diff             @@
##           master   #15735      +/-   ##
==========================================
- Coverage   91.01%   90.99%   -0.02%     
==========================================
  Files         143      143              
  Lines       49396    49380      -16     
==========================================
- Hits        44958    44934      -24     
- Misses       4438     4446       +8
```


| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/15735?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/core/series.py](https://codecov.io/gh/pandas-dev/pandas/compare/59b88ab6123338e1dfcc0f77dfb3e5c4c511889a...f268b939ddfb91b67495efd0d5a64b654e07db93?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvc2VyaWVzLnB5) | `94.86% <ø> (-0.03%)` | :arrow_down: |
| [pandas/core/frame.py](https://codecov.io/gh/pandas-dev/pandas/compare/59b88ab6123338e1dfcc0f77dfb3e5c4c511889a...f268b939ddfb91b67495efd0d5a64b654e07db93?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZnJhbWUucHk=) | `97.86% <ø> (-0.11%)` | :arrow_down: |
| [pandas/indexes/base.py](https://codecov.io/gh/pandas-dev/pandas/compare/59b88ab6123338e1dfcc0f77dfb3e5c4c511889a...f268b939ddfb91b67495efd0d5a64b654e07db93?src=pr&el=tree#diff-cGFuZGFzL2luZGV4ZXMvYmFzZS5weQ==) | `96.14% <ø> (-0.01%)` | :arrow_down: |
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/compare/59b88ab6123338e1dfcc0f77dfb3e5c4c511889a...f268b939ddfb91b67495efd0d5a64b654e07db93?src=pr&el=tree#diff-cGFuZGFzL2lvL2dicS5weQ==) | `25% <0%> (-58.34%)` | :arrow_down: |
| [pandas/tseries/index.py](https://codecov.io/gh/pandas-dev/pandas/compare/59b88ab6123338e1dfcc0f77dfb3e5c4c511889a...f268b939ddfb91b67495efd0d5a64b654e07db93?src=pr&el=tree#diff-cGFuZGFzL3RzZXJpZXMvaW5kZXgucHk=) | `95.39% <0%> (+0.09%)` | :arrow_up: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/15735?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/15735?src=pr&el=footer). Last update [59b88ab...f268b93](https://codecov.io/gh/pandas-dev/pandas/compare/59b88ab6123338e1dfcc0f77dfb3e5c4c511889a...f268b939ddfb91b67495efd0d5a64b654e07db93?el=footer&src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments). thanks!