ENH pandas-dev#60693: shift operations for Series and DataFrames
This commit introduces the rshift and lshift method for both Series and DataFrames in pandas. It also adds the corresponding in-place methods.
These methdos don't work between a Series and a Dataframe, or if the two Series or DataFrames differ in size.

- [x] closes #60693
- [x] [Tests added and passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#writing-tests) if fixing a bug or adding a new feature
- [x] All [code checks passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit).
- [x] Added [type annotations](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#type-hints) to new arguments/methods/functions.
- [x] Added an entry in the latest `doc/source/whatsnew/vX.X.X.rst` file if fixing a bug or adding a new feature.

@mroeschke Any chance this would be worth adding to pandas? Going to close this PR until a decision has been made on the original issue