feat: provide additional order assertions is_before, is_after and is_between

[haraldmaida]

For some types of values the intent of an assertion of the order of values could be better expressed with words "is before" and "is after". For example for date and time values it may be more clear to assert that some date is before April 20, 2025.

Therefore the additional assertions is_before, is_after and is_between have been implemented.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.62%. Comparing base (4549502) to head (dd3665e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #16      +/-   ##
==========================================
+ Coverage   93.47%   93.62%   +0.15%     
==========================================
  Files          22       22              
  Lines        1991     2038      +47     
  Branches     1991     2038      +47     
==========================================
+ Hits         1861     1908      +47     
  Misses        124      124              
  Partials        6        6              

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