ENH: Modify intersect1d to return common indices (#10684)

* added function commonpts1d

* Update arraysetops.py

* Update arraysetops.py

* modified intersect1d to return common indices

Proposed this idea in previous pull request (https://github.com/numpy/numpy/pull/10683) and made suggested changes for implementing this idea to have relevant common indices that correspond to the values in the intersection of the two arrays.

* update intersect1d with suggested changes

* implemented return_indices options for intersect1d

I've tested out the above code and for the ~10 different test sets I've tried it's worked thus far. It's probably not the cleanest implementation but it works and is vectorized.

* cleaned up structure for intersect1d

* fixed copy-paste error, added second test, changed a conditional

* Testing return_indices in intersect1d

* formatting

* created separate test function  for intersect1d indices, added spaces after commas

* fixed up example and some style

* fixed style

* style change

* removed one example

* removed extra space

* added version number for return_indices

* added 'return_indices' keyword for np.intersect1d

* fixed formatting

* updated return_indices entry

* fixed some typos and style

* added bit about first instance of a value being used

* STY: Fix comment formats

* DOC: missing space

* DOC: correct parameter names in docstring

* made suggested changes

* fixed a mistake from previous update

also added documentation for comm1, comm2 to match doc from np.unique

* added in tests for 2d inputs

* STY: Add missing spaces around commas

* TST: Correct array to actually be unique

* STY: Spaces at beginning of comments

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