Adds runtime warning on divide-by-zero, fixes use of "out" and "where" in arctan2

[drculhane]

Closes #5132 and #5149.

This takes the place of PR #5204.

• The binops in pdarrayclass.py now give a RuntimeWarning or a Floating Point Error (or nothing) if / or // cause a divide-by-zero, depending on the "divide" setting of ak.errstate.

• Because the RuntimeWarning surfaced an issue in arctan2, I've rewritten that function somewhat. It now has an "out" parameter matching numpy, and uses the "where" parameter correctly.

• arctan2 now also accepts bool inputs, which requires special handling. np.arctan2, if given bool inputs, returns np.float16, which arkouda doesn't like.

• Most of the original arctan2 function remains as _arctan2_, because (subjective opinion here) I think that calling it as a separate function improves the readability of the code.

• In doing this rewriting, I removed some mypy ignores that are no longer needed.

• I rewrote the unit tests for arctan2 to use our newer assert functions. I think this cleans up that code significantly. In the cases that use "where," I check both the returned result, and the returned "out" pdarray, since they should match.

[codecov]

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