feature: handle overlapping routes (#5187)

[mmerrill3]

Implemenation for handling non local routes that already exist for #5187
Signed-off-by: mmerrill3 jjpaacks@gmail.com

[codecov-commenter]

Codecov Report

Merging #5233 (a9d24d2) into master (1bbdbc2) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #5233      +/-   ##
==========================================
- Coverage   95.85%   95.84%   -0.01%     
==========================================
  Files         688      688              
  Lines       67977    68061      +84     
==========================================
+ Hits        65156    65232      +76     
- Misses       2821     2829       +8     

Flag	Coverage Δ
servertests	36.46% <52.94%> (-0.03%)	⬇️
unittests	95.78% <100.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
moto/ec2/exceptions.py	97.61% <100.00%> (+0.02%)	⬆️
moto/ec2/models/route_tables.py	95.58% <100.00%> (+0.16%)	⬆️
moto/resourcegroupstaggingapi/models.py	82.93% <0.00%> (-0.60%)	⬇️
moto/sns/models.py	96.81% <0.00%> (-0.40%)	⬇️
moto/route53/responses.py	86.91% <0.00%> (-0.34%)	⬇️
moto/sqs/models.py	96.73% <0.00%> (-0.18%)	⬇️
moto/config/models.py	99.21% <0.00%> (-0.14%)	⬇️
moto/ssm/models.py	94.50% <0.00%> (-0.11%)	⬇️
moto/greengrass/responses.py	100.00% <0.00%> (ø)
moto/greengrass/models.py	99.06% <0.00%> (+0.31%)	⬆️

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[mmerrill3]

@bblommers ready for review

[bblommers]

Nice one - thanks @mmerrill3!

[github-actions]

This is now part of moto >= 3.1.14.dev11