Add Sorting, searching, and counting functions to Numpy Frontend

[Aarsh2001]

Add Sorting, searching, and counting functions to Numpy frontend:

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Please keep in mind that the proper way to link an issue to this list is to comment "- [ ] #issue_number" while the issue's title only includes the name of the function you've chosen.
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• sort #5647
• lexsort #7126
• argsort #3718
• msort #4498
• sort_complex #7420
• partition #15870
• argpartition #20880
• argmax #3470
• nanargmax #4497
• argmin #4485
• nanargmin #4496
• argwhere #4488
• nonzero #4486
• flatnonzero #4006
• where #4487
• searchsorted #4005
• extract #14932
• count_nonzero #4484

The main file paths where these functions are likely to be added are:

ivy/functional/frontends/numpy/sorting\_searching\_counting/sorting.py
ivy\_tests/test\_ivy/test\_frontends/test\_numpy/test\_sorting\_searching\_counting/test\_sorting.py
ivy/functional/frontends/numpy/sorting\_searching\_counting/counting.py
ivy/functional/frontends/numpy/sorting\_searching\_counting/searching.py
ivy\_tests/test\_ivy/test\_frontends/test\_numpy/test\_sorting\_searching\_counting/test\_counting.py
ivy\_tests/test\_ivy/test\_frontends/test\_numpy/test\_sorting\_searching\_counting/test\_searching.py
ivy/functional/frontends/numpy/logic/array\_type\_testing.py
ivy\_tests/test\_ivy/test\_frontends/test\_numpy/test\_logic/test\_array\_type\_testing.py

[sampreet-arthi]

I would like to take up this issue

[sampreet-arthi]

There seem to be a lot of functions in this which haven't been implemented in ivy/functional and/or in the backends, should I also add them to those files or just focus on the ones which have already been implemented?

[Kaustav-Sarkar]

The functions where and nonzero are implemented

[cristinelpopescu]

Issue 3470: added argmax function to NumPy frontend, I already created a pull request.