Add sliding window

[pavlis]

This branch implements the sliding window algorithm with Futures whose development is described in Discussion #656. I've also included a complete pytest suite for the function to verify all features work - at least on simple data.

mspass-team members please evaluate the api critically. Also because this is a generic function are there additional sanity checks on the arguments that need to be added?

Hopefully this will pass tests clean, but it is possible the use of a dask.distributed.LocalCluster may behave differently on github than on the machine I ran pytest.

[pavlis]

Something is breaking in the ml library. Pull request #682 is failing for the same reason. @wangyinz I hope you can resolve this as I have no idea how to fix it.

[codecov]

Codecov Report

❌ Patch coverage is 96.15385% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.46%. Comparing base (bff2a3e) to head (d5743aa).

Files with missing lines	Patch %	Lines
python/mspasspy/workflow.py	96.15%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #684      +/-   ##
==========================================
+ Coverage   59.11%   59.46%   +0.34%     
==========================================
  Files         158      159       +1     
  Lines       25909    26013     +104     
  Branches     1520     1520              
==========================================
+ Hits        15317    15468     +151     
+ Misses      10125    10079      -46     
+ Partials      467      466       -1     

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