Refactor ContextValueExtractor + Bump dev deps + Improve rector CI

[vjik]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.56%. Comparing base (01b0881) to head (12acd8f).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #124   +/-   ##
=========================================
  Coverage     99.56%   99.56%           
+ Complexity      162      161    -1     
=========================================
  Files            11       11           
  Lines           464      464           
=========================================
  Hits            462      462           
  Misses            2        2           

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