add lzf decompress filter

[kmuehlbauer]

Description

As described in #89 we want to add more decompression filters. LZF is used within the xarray testsuite and by implementing this will fix the xarray testsuite for the H5NetCDF related tests.

This also serves as a blueprint for other filters (blosc, lzma etc.).

Before you get started

• ☝ Create an issue to discuss what you are going to do - Issue Scale/Offset (and maybe other?) Filters #89 already open

Checklist

• This pull request has a descriptive title and labels
• This pull request has a minimal description (most was discussed in the issue, but a two-liner description is still desirable)
• Unit tests have been added (if codecov test fails)
• Any changed dependencies have been added or removed correctly (if need be)
• If you are working on the documentation, please ensure the current build passes
• All tests pass

[codecov]

Codecov Report

❌ Patch coverage is 72.72727% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.13%. Comparing base (29b2b59) to head (34e4a57).
⚠️ Report is 175 commits behind head on main.

Files with missing lines	Patch %	Lines
pyfive/btree.py	62.50%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #136      +/-   ##
==========================================
+ Coverage   74.03%   74.13%   +0.09%     
==========================================
  Files          11       11              
  Lines        2596     2606      +10     
  Branches      406      408       +2     
==========================================
+ Hits         1922     1932      +10     
- Misses        565      566       +1     
+ Partials      109      108       -1     

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[bmaranville]

It is impressive how straightforward this is compared to compiling a dynamic link library and loading it at runtime, as is needed when using plugins with the C library.

[kmuehlbauer]

@bmaranville I really thought, can it be that easy?, by looking at the gzip above.

[valeriupredoi]

the DLL is still there, but conda-forge compiled packages are the stuff of dreams 😁

[valeriupredoi]

spiffy, and with very many thanks as ever, @kmuehlbauer 🍺 @bnlawrence wanna have a final look and merge, please? 🍺

[bnlawrence]

Looks good to me. Thanks!!!