feat: Support allOf additionalProperties merging if both are the equal

[abemedia]

We have a bunch of objects we merge using allOf where both have the exact same value for additionalProperties, however we get the following error:

Feature "allOf additionalProperties merging" is not implemented yet.

This PR adds support for merging if both items are equal.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.

Project coverage is 72.73%. Comparing base (e2dc75e) to head (887f69a).
Report is 12 commits behind head on main.

Files with missing lines	Patch %	Lines
gen/schema_gen_sum.go	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1330      +/-   ##
==========================================
- Coverage   72.74%   72.73%   -0.02%     
==========================================
  Files         190      190              
  Lines       13096    13101       +5     
==========================================
+ Hits         9527     9529       +2     
- Misses       3017     3021       +4     
+ Partials      552      551       -1     

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[tdakkota]

LGTM in general, but probably we should merge additionalProperties schemas, if we can.

[abemedia]

@tdakkota have amended to merge the schemas.