Issue #98: Adding `page` and `page_size` parameter to export_text_analysis

[DavidHuebner]

• adding page and page_size as parameters to export_text_analysis
• some documentation
• added unit test (but also tested it in live product, see comment: https://github.com/averbis/averbis-python-api/issues/98#issuecomment-988057715)

[codecov-commenter]

Codecov Report

Merging #99 (4724208) into dev (44d78a5) will decrease coverage by 0.04%. The diff coverage is 66.66%.

@@            Coverage Diff             @@
##              dev      #99      +/-   ##
==========================================
- Coverage   91.29%   91.25%   -0.05%     
==========================================
  Files          16       16              
  Lines        1838     1840       +2     
==========================================
+ Hits         1678     1679       +1     
- Misses        160      161       +1     

Impacted Files	Coverage Δ
averbis/core/_rest_client.py	85.42% <66.66%> (-0.08%)	:arrow_down:

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[DavidHuebner]

Ready to be reviewed.