change constructors

[reuvenharrison]

This PR adds constructors for the Change objects: ApiChange, ComponentChange and SecurityChange.
Goals:

• reuse code and eliminate bugs
• set Level automatically
• add a new field: custom attributes

[codecov]

Codecov Report

Attention: Patch coverage is 86.71288% with 230 lines in your changes missing coverage. Please review.

Project coverage is 85.90%. Comparing base (e2e437b) to head (b0670ce).
Report is 1 commits behind head on main.

Files	Patch %	Lines
...cker/check_request_property_min_items_increased.go	0.00%	20 Missing ⚠️
checker/check_request_property_min_items_set.go	0.00%	20 Missing ⚠️
checker/check_request_property_min_set.go	0.00%	20 Missing ⚠️
checker/check_request_property_min_updated.go	50.00%	20 Missing ⚠️
checker/check_response_property_max_increased.go	0.00%	20 Missing ⚠️
checker/check_response_property_min_decreased.go	0.00%	20 Missing ⚠️
checker/check_response_property_min_items_unset.go	0.00%	20 Missing ⚠️
...ecker/check_request_header_property_became_enum.go	50.00%	10 Missing ⚠️
...r/check_request_header_property_became_required.go	50.00%	10 Missing ⚠️
checker/check_request_parameters_max_set.go	0.00%	10 Missing ⚠️
... and 6 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #569      +/-   ##
==========================================
+ Coverage   84.91%   85.90%   +0.98%     
==========================================
  Files         228      228              
  Lines       12976    12984       +8     
==========================================
+ Hits        11019    11154     +135     
+ Misses       1551     1415     -136     
- Partials      406      415       +9     

Flag	Coverage Δ
unittests	85.90% <86.71%> (+0.98%)	⬆️

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