feat: propagate tags to DomainName, Stage resources

[keetonian]

Issue #, if available:
#1478

Description of changes:
Propagates tags to generated resources.

Description of how you validated changes:
Deployed templates with sample changes, unit testing.

Checklist:

• Write/update tests
• make pr passes
• Update documentation
• Verify transformed template deploys and application functions as expected
• Add/update example to examples/2016-10-31

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[alexw91]

Codecov Report

Merging #1492 into develop will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #1492   +/-   ##
========================================
  Coverage    94.13%   94.13%           
========================================
  Files           78       78           
  Lines         4926     4928    +2     
  Branches       991      991           
========================================
+ Hits          4637     4639    +2     
  Misses         134      134           
  Partials       155      155           

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[codecov-io]

Codecov Report

Merging #1492 into develop will increase coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop    #1492      +/-   ##
===========================================
+ Coverage    94.13%   94.13%   +<.01%     
===========================================
  Files           78       78              
  Lines         4926     4928       +2     
  Branches       991      991              
===========================================
+ Hits          4637     4639       +2     
  Misses         134      134              
  Partials       155      155

Impacted Files	Coverage Δ
samtranslator/model/apigatewayv2.py	94.73% <ø> (ø)	⬆️
samtranslator/model/api/http_api_generator.py	92.33% <100%> (+0.06%)	⬆️

---

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Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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