Add resampling function/algorithm

[aaron-schroeder]

A form of functionality already appears in this package.

But I want to make it more general. Resample any column in the dataframe based on another one (as long as that one is monotonic increasing, like distance, time, or timestamp. Potentially this could extend to resampling the entire DataFrame this way, but I don't see that being immediately necessary.

[aaron-schroeder]

The algorithm's now included in pandas_xyz/algorithms.py, but:

• It doesn't work right when the resampled distance values don't fall at existing data points
• It can't be added to the accessor without somehow addressing function wrappers: remove inferences based on argument names #2