[FEA] Add a `find_peaks` function

[Cliff Burdick]

find_peaks is a useful function for giving the user a powerful interface to find one or more peaks in a signal based on some criteria. The SciPy find_peaks has many features, some of which aren't used as much. This issue is for implementing an MVP of this function with the distance, threshold, and height parameters.

https://docs.scipy.org/doc/scipy/reference/generated/scipy.signal.find_peaks.html