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MAINT: Do not override `sliding_window_view` module to `numpy`

API: Do not import sliding_window_view to main namespace

At least for now, lets not import it to the main namespace, since there is
no agreement that this is a good idea.

REV: Revert gh-17654 - f2py incorrectly translates dimension declarations. 

MAINT: Add more files to `.gitgnore`

* implement sliding_window_view #7753
Test cases are shown in the issue page.

* Add Example Cases

* Add step_size and N-dim support

* Add shape and step_size check. Remove warning.

* Remove shape default
Add step_size default's description.

* Give proper parameter name 'step'

* fix a parameter description mistake

* implement test function for sliding_window_view()

* implement test function for sliding_window_view()

* Fix according to @eric-wieser comments

* Change arange to ogrid in Examples

* remove np.squeeze on return line

* Clarify document to avoid parameter confusion.

* add `writable` and more explanation in docs

* resolve a write conflit

* fixes according to @seberg review

* resolve write hazard

* remove outdated docs.

* change referring according to @mattip.
change 'writeable' to 'readonly' as @seberg suggest.
remove 'step' as @eric-wieser request

* fix test minor error

* DOC: Grammar fixes

* STY: Add missing line break required by PEP8

* + Change readonly parameter to writeable.
+ Update writeable description.
+ Fix a few parameter checks.
+ Other minor improvements.

* Move to new api as proposed by @eric-wieser

- Change api to follow suggestion by Eric Wieser in
  https://github.com/numpy/numpy/pull/10771#issuecomment-524715356
- Update docstring
- Add more tests

* Improve documentation

* Add sliding_window_view to documentation index

* Apply suggestions from code review

Co-authored-by: Eric Wieser <wieser.eric@gmail.com>

* Fix window shape check

* Add `sliding_window_view` to __all__

* Add tests for  error cases

* Add array_function dispatching

* Change dispatcher argument defaults to None

* Simplify array function dispatching

* Added "np." prefix to doctests

* Split tests

* Improved docstring

* Add release note

* Fix docstring formatting

* Fix doctest

* Remove namespacing in documentation indexing

* Improve docstring

* Improved docstring

* Simplified docstring

* Improve docstring to make pseudo code stand out

* Improve docstring

* Add simple application example

* Correct release note

* Improve link with as_strides

* Add note about performance

* Tidy up main doc string

* Make language on performance warning stronger

* Bugfix: pass subok and writeable to as_strided

* Add writeable test

* Add subok test

* Change subok test to use custom array subclass instead of unsupported MaskedArray

* Add version added information

Co-authored-by: Eric Wieser <wieser.eric@gmail.com>

Co-authored-by: Fanjin <fjzeng@ucsd.edu>
Co-authored-by: Fanjin Zeng <Fnjn@users.noreply.github.com>
Co-authored-by: Eric Wieser <wieser.eric@gmail.com>
Co-authored-by: fanjin <fjzeng@outlook.com>

Closes gh-7753

Closes gh-17702