[LibLz4] Add LZ4 HDF5

[nhz2]

This is an implementation of the LZ4 HDF5 format based on HDFGroup/hdf5_plugins#173

This PR has tests for compatibility with https://github.com/JuliaIO/HDF5.jl/blob/master/ext/CodecLz4Ext/CodecLz4Ext.jl

imagecodecs compatibility is currently broken due to a bug in imagecodecs: cgohlke/imagecodecs#126

It would be good to test compatibility with the C code in https://github.com/HDFGroup/hdf5_plugins but I'm unsure how to set that up.

CC @mkitti

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 98.51852% with 2 lines in your changes missing coverage. Please review.

Project coverage is 96.32%. Comparing base (069e023) to head (3b1e47b).

Files with missing lines	Patch %	Lines
LibLz4/src/decode.jl	98.55%	1 Missing ⚠️
LibLz4/src/encode.jl	98.43%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #27      +/-   ##
==========================================
+ Coverage   95.42%   96.32%   +0.90%     
==========================================
  Files           5        5              
  Lines         328      463     +135     
==========================================
+ Hits          313      446     +133     
- Misses         15       17       +2     

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