implement parse_expected_val_pairs2()

[SimeonEhrig]

Same functionality like parse_expected_val_pairs() but much nicer interface. See diff of this PR.

I will not port all tests from parse_expected_val_pairs() to parse_expected_val_pairs2() because it is a big amount work. The function should be used for new tests and if tests will be overworked.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.14%. Comparing base (abca5d6) to head (330c689).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #54   +/-   ##
=======================================
  Coverage   95.14%   95.14%           
=======================================
  Files          10       10           
  Lines         700      701    +1     
  Branches      213      213           
=======================================
+ Hits          666      667    +1     
  Misses         15       15           
  Partials       19       19           

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