feat: provide decimal number specific assertions has_scale_of, has_precision_of and is_integer

[haraldmaida]

Decimal numbers have the specific properties scale and precision. It should be possible to assert those properties through explicitly provided assertion methods.

Added assertion methods has_scale_of, has_precision_of and is_integer for decimal numbers. They have been implemented for bigdecimal::BigDecimal and rust_decimal::Decimal.

These assertions are implemented for all types that implement the property trait DecimalProperties. This allows to implement those assertions for other decimal types by just implementing the trait DecimalProperties for those types.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.69%. Comparing base (130cc5f) to head (6d14803).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #49      +/-   ##
==========================================
+ Coverage   96.62%   96.69%   +0.07%     
==========================================
  Files          30       30              
  Lines        3345     3416      +71     
  Branches     3345     3416      +71     
==========================================
+ Hits         3232     3303      +71     
  Misses        109      109              
  Partials        4        4              

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