feat(HttpApi): add support for FailOnWarnings

[keetonian]

Issue #, if available:
#1499
Description of changes:

Description of how you validated changes:

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.

[praneetap]

Just one quick note- can we add documentation? and add it to all the http example templates so people start to follow it as best practice?

[keetonian]

Added to documentation. Can add to release notes as well

[codecov-io]

Codecov Report

Merging #1509 into develop will increase coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop    #1509      +/-   ##
===========================================
+ Coverage    94.09%   94.09%   +<.01%     
===========================================
  Files           78       78              
  Lines         4925     4928       +3     
  Branches       990      991       +1     
===========================================
+ Hits          4634     4637       +3     
  Misses         135      135              
  Partials       156      156

Impacted Files	Coverage Δ
samtranslator/plugins/globals/globals.py	99.05% <ø> (ø)	⬆️
samtranslator/model/sam_resources.py	94.29% <ø> (ø)	⬆️
samtranslator/model/api/http_api_generator.py	91.6% <100%> (+0.1%)	⬆️

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