Issue #133: Support type filter for exporting as CAS

[UWinch]

What's in the PR?

Support optional parameter in export_text_analysis_to_casto limit the export to specific annotation types.

How to test manually

• Export the textanalysis result of a specific collection, process and document as CAS with export_text_analysis_to_cas and specifiy the annotation type(s) you would like to export.
• Check that only those types were exported.
• Check that export without this parameter still works.

[codecov-commenter]

Codecov Report

Merging #136 (eb73339) into dev (234196f) will increase coverage by 0.06%. The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##              dev     #136      +/-   ##
==========================================
+ Coverage   92.24%   92.31%   +0.06%     
==========================================
  Files          16       16              
  Lines        2167     2212      +45     
==========================================
+ Hits         1999     2042      +43     
- Misses        168      170       +2     

Impacted Files	Coverage Δ
averbis/core/_rest_client.py	86.83% <100.00%> (+0.07%)	:arrow_up:
tests/fixtures.py	98.03% <100.00%> (+0.26%)	:arrow_up:
tests/test_process.py	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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