Add additional parameters to ZstdCompressor

[mkitti]

This draft pull request adds additional parameters for the compressor.
The implementation uses a Dict{LibZstd.ZSTD_cParameter, Cint} to store the parameters.
The properties are the overloaded to reflect the parameters.

[codecov]

Codecov Report

Attention: Patch coverage is 63.63636% with 16 lines in your changes missing coverage. Please review.

Project coverage is 61.42%. Comparing base (e7edfed) to head (5c16f36).

Files with missing lines	Patch %	Lines
src/compression.jl	58.06%	13 Missing ⚠️
src/libzstd.jl	76.92%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #73      +/-   ##
==========================================
- Coverage   61.55%   61.42%   -0.14%     
==========================================
  Files           5        5              
  Lines         372      407      +35     
==========================================
+ Hits          229      250      +21     
- Misses        143      157      +14     

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[mkitti]

This will have to be reworked if #71 gets merged. I'm not sure about the status of that pull request.