Add a property interface to ZstdCompressor, add ZstdError type

[mkitti]

Allow compression parameters to be set as properties

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 13 lines in your changes are missing coverage. Please review.

Project coverage is 34.12%. Comparing base (4c799fe) to head (ab87b58).

Files	Patch %	Lines
src/compression.jl	47.82%	12 Missing ⚠️
src/libzstd.jl	93.75%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #48      +/-   ##
==========================================
+ Coverage   30.98%   34.12%   +3.14%     
==========================================
  Files           5        5              
  Lines         510      548      +38     
==========================================
+ Hits          158      187      +29     
- Misses        352      361       +9     

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