feat: add above_threshold()

[rich-iannone]

This PR adds a new above_threshold() method to the Validate class, providing a non-exception alternative to above_threshold(). This enables more flexible programmatic responses to validation results (with a simple boolean return value). The main features of this include (1) checks of 'warning'/'error'/'critical' thresholds (without exceptions), (2) support for checking specific step numbers, and (3) a simple boolean return value for conditional logic.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.06%. Comparing base (aff980a) to head (54d72e7).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #184   +/-   ##
=======================================
  Coverage   99.05%   99.06%           
=======================================
  Files          18       18           
  Lines        4467     4480   +13     
=======================================
+ Hits         4425     4438   +13     
  Misses         42       42           

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