feat: assert types formatted for debug and display

[haraldmaida]

For opaque types and espacially for Error types it can be handy to assert the debug or display string of a type.

Implemented the assertions has_debug_message and does_not_have_debug_message for types that implement core::fmt::Debug and the assertions has_display_message and does_not_have_display_message for types that implement core::fmt::Display.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.91%. Comparing base (eeceab3) to head (a2a6060).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #56      +/-   ##
==========================================
+ Coverage   93.84%   93.91%   +0.07%     
==========================================
  Files          32       32              
  Lines        4546     4600      +54     
  Branches     4546     4600      +54     
==========================================
+ Hits         4266     4320      +54     
  Misses        234      234              
  Partials       46       46              

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