add deprecation warning to resample function

[alisnwu]

closes #139

Only adding a deprecation warning as per discussion with @Sparks29032 in #145

Warning looks like this:

@sbillinge ready for review

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.56%. Comparing base (b31135d) to head (af7ffd4).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #180   +/-   ##
=======================================
  Coverage   99.56%   99.56%           
=======================================
  Files           7        7           
  Lines         230      230           
=======================================
  Hits          229      229           
  Misses          1        1           

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[Sparks29032]

We could also consider using @deprecated per https://typing.readthedocs.io/en/latest/spec/directives.html#deprecated

I think we should also phase the message in a way that indicates why we are deprecating: resample has been renamed wsinterp to better reflect functionalty smth smth

[sbillinge]

Yes, I agree with @Sparks29032 . Also please specify the future version where it will be removed. Normally two mid-level version bumps later.