Fix queue url generation for redrivePolicy in SNS events.

[tcastelli]

Fixes the error introduced in #7239 by not generating the queue Url and allowing to pass Ref as an input. Now the deadLetterTargetArn can be either defined as a string or using Fn::GetAtt, and the url will be generated automatically from that.

Still needs more testing but can be reviewed for structural decissions

Closes #7276

[tcastelli]

I have tested this locally with one of my projects and I could deploy it sucessfully after this fix 👍

[tcastelli]

I've created this, since the previously generated names for the queue policy looked wrong (were referencing eventMapping) since they were designed for a Queue and not for a QueuePolicy

[tcastelli]

Since this implementation was lacking the option to use any arn defined without GetAtt or a string, I've added the option to also define the url for the queue, so now people can also use Fn:ImportValue or Fn::Join
What do you think? @medikoo @maafk

[medikoo]

Thnank you @tcastelli looks good. Let me know what you think about my simplification proposal

[tcastelli]

Just updated the PR with latest changes requested. Please take a look when you can @medikoo

[codecov-io]

Codecov Report

Merging #7277 into master will increase coverage by <.01%.
The diff coverage is 80.11%.

@@            Coverage Diff             @@
##           master    #7277      +/-   ##
==========================================
+ Coverage   87.95%   87.96%   +<.01%     
==========================================
  Files         240      240              
  Lines        8969     8972       +3     
==========================================
+ Hits         7889     7892       +3     
  Misses       1080     1080

Impacted Files	Coverage Δ
lib/plugins/logs/logs.js	92.85% <ø> (ø)	⬆️
commitlint.config.js	0% <ø> (ø)	⬆️
lib/plugins/index.js	100% <ø> (ø)	⬆️
lib/plugins/aws/deploy/lib/uploadArtifacts.js	90.47% <100%> (ø)	⬆️
lib/plugins/aws/package/compile/functions/index.js	97.98% <100%> (ø)	⬆️
lib/plugins/aws/provider/awsProvider.js	93.22% <100%> (ø)	⬆️
...mpile/events/lib/ensureApiGatewayCloudWatchRole.js	100% <100%> (ø)	⬆️
lib/plugins/aws/package/lib/mergeIamTemplates.js	100% <100%> (ø)	⬆️
...kage/compile/events/apiGateway/lib/method/index.js	100% <100%> (ø)	⬆️
.../package/compile/events/apiGateway/lib/validate.js	96.94% <100%> (ø)	⬆️
... and 30 more

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[medikoo]

Looks great @tcastelli ! Taking this in