Relocate static factory methods, closes #178

[dmfs]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 85.71429% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 96.53%. Comparing base (8ecf4c4) to head (bc68d98).

Files	Patch %	Lines
...rg/saynotobugs/confidence/json/quality/Number.java	0.00%	1 Missing ⚠️
...rg/saynotobugs/confidence/json/quality/Object.java	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##               main     #179      +/-   ##
============================================
- Coverage     97.78%   96.53%   -1.26%     
+ Complexity      845      838       -7     
============================================
  Files           217      218       +1     
  Lines          1855     1876      +21     
  Branches         59       59              
============================================
- Hits           1814     1811       -3     
- Misses           32       55      +23     
- Partials          9       10       +1     

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