Add Fn::Cidr as Fn::Join supported function

[kddejong]

Issue #, if available:
fix #3383
Description of changes:

• Add Fn::Cidr as Fn::Join supported function

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.20%. Comparing base (5d5e6c8) to head (a276fa7).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3401      +/-   ##
==========================================
- Coverage   93.23%   93.20%   -0.04%     
==========================================
  Files         323      323              
  Lines       11005    11016      +11     
  Branches     2299     2301       +2     
==========================================
+ Hits        10261    10267       +6     
- Misses        415      417       +2     
- Partials      329      332       +3     

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