Issue #141: Get document typesystem by name instead of id

[UWinch]

What's in the MR?

• get typesystem of a document text analysis result by document name instead of identifier
• still allow getting by document identifier

[codecov-commenter]

Codecov Report

Merging #142 (4194abc) into dev (67fe0c2) will increase coverage by 0.13%. The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##              dev     #142      +/-   ##
==========================================
+ Coverage   92.18%   92.32%   +0.13%     
==========================================
  Files          16       16              
  Lines        2176     2214      +38     
==========================================
+ Hits         2006     2044      +38     
  Misses        170      170              

Impacted Files	Coverage Δ
averbis/core/_rest_client.py	86.86% <100.00%> (+0.18%)	:arrow_up:
tests/fixtures.py	98.03% <100.00%> (+0.26%)	:arrow_up:
tests/test_pipeline.py	100.00% <100.00%> (ø)
tests/test_process.py	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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