fix(httpapi): nest securitySchemes under components section in openapi

[keetonian]

Issue #, if available:
#1300

Description of changes:
Fix securitySchemes to be in the correct place in OpenApi doc.

Description of how you validated changes:
Spec: https://swagger.io/docs/specification/authentication/

Tests updated and verified.

Checklist:

• Write/update tests
• make pr passes
• Update documentation
• Verify transformed template deploys and application functions as expected

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

[ShreyaGangishetty]

This looks good to me

[codecov-io]

Codecov Report

Merging #1301 into develop will decrease coverage by 0.21%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop    #1301      +/-   ##
===========================================
- Coverage    94.61%   94.39%   -0.22%     
===========================================
  Files           78       78              
  Lines         4252     4282      +30     
  Branches       844      854      +10     
===========================================
+ Hits          4023     4042      +19     
- Misses         110      114       +4     
- Partials       119      126       +7

Impacted Files	Coverage Δ
samtranslator/open_api/open_api.py	93.6% <100%> (+0.03%)	⬆️
samtranslator/model/eventsources/pull.py	82.05% <0%> (-12.6%)	⬇️
samtranslator/model/eventsources/push.py	90.89% <0%> (+0.01%)	⬆️
samtranslator/model/iam.py	86.36% <0%> (+5.11%)	⬆️

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