Pubpub zz extract text

[MartinThoma]

Main PR is here: #969

This PR is meant to be closed. It's just for me (Martin) to try things out. #969 should get merged.

[codecov]

Codecov Report

Merging #971 (1223d75) into main (336d659) will decrease coverage by 0.40%.
The diff coverage is 76.19%.

@@            Coverage Diff             @@
##             main     #971      +/-   ##
==========================================
- Coverage   84.26%   83.85%   -0.41%     
==========================================
  Files          18       18              
  Lines        4117     4149      +32     
  Branches      868      878      +10     
==========================================
+ Hits         3469     3479      +10     
- Misses        465      482      +17     
- Partials      183      188       +5     

Impacted Files	Coverage Δ
PyPDF2/_cmap.py	70.39% <69.76%> (-2.34%)	⬇️
PyPDF2/generic.py	89.70% <81.81%> (-0.13%)	⬇️
PyPDF2/_page.py	81.72% <100.00%> (+0.18%)	⬆️
PyPDF2/_utils.py	90.84% <0.00%> (-7.19%)	⬇️

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