Add windowLog support

[nhz2]

Fixes #79

This PR adds support for the windowLog compression parameter and the windowLogMax decompression parameter.

This corresponds to the --long[=#] cli option, and is required to read certain zstd files.

XRef: https://discourse.julialang.org/t/decompression-of-large-files/132191

[codecov]

Codecov Report

❌ Patch coverage is 89.79592% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.19%. Comparing base (bce7567) to head (e9379ae).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/compression.jl	88.46%	3 Missing ⚠️
src/decompression.jl	91.30%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #82      +/-   ##
==========================================
+ Coverage   61.18%   64.19%   +3.00%     
==========================================
  Files           4        4              
  Lines         353      391      +38     
==========================================
+ Hits          216      251      +35     
- Misses        137      140       +3     

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[mkitti]

Are we going to need to do this for all of the parameters eventually?

This can go ahead, but I want to think of about the overall strategy to cover all of the parameters.

[nhz2]

I think the less commonly needed and experimental parameters could use something like in #73 or https://github.com/JuliaIO/ChunkCodecs.jl/blob/c1e9c01e531a29c9bb554d7a93e7e57ecd4b3045/LibZstd/src/encode.jl#L21-L30

windowLog is a bit special because it benefits from specific error handling and docs.