feat: add TimeoutInMillis to HttpApi events

[keetonian]

Issue #, if available:
#1317

Description of changes:
Allow setting TimeoutInMillis on HttpApi events.

Description of how you validated changes:
make pr

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.

[keetonian]

Will deploy a template and verify that this sets the timeout as expected.

[codecov-io]

Codecov Report

Merging #1450 into develop will decrease coverage by 0.01%.
The diff coverage is 85.71%.

@@             Coverage Diff             @@
##           develop    #1450      +/-   ##
===========================================
- Coverage    94.37%   94.36%   -0.02%     
===========================================
  Files           78       78              
  Lines         4678     4685       +7     
  Branches       934      937       +3     
===========================================
+ Hits          4415     4421       +6     
  Misses         121      121              
- Partials       142      143       +1

Impacted Files	Coverage Δ
samtranslator/model/eventsources/push.py	90.75% <100%> (+0.03%)	⬆️
samtranslator/open_api/open_api.py	93.51% <80%> (-0.38%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 8121fcc...eed3214. Read the comment docs.

[keetonian]

Template verified.

[alexw91]

Codecov Report

Merging #1450 into develop will decrease coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #1450      +/-   ##
===========================================
- Coverage    94.37%   94.36%   -0.02%     
===========================================
  Files           78       78              
  Lines         4678     4685       +7     
  Branches       934      937       +3     
===========================================
+ Hits          4415     4421       +6     
  Misses         121      121              
- Partials       142      143       +1     

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 8121fcc...2b19aa1. Read the comment docs.

[codecov-io]

Codecov Report

Merging #1450 into develop will decrease coverage by 0.01%.
The diff coverage is 85.71%.

@@             Coverage Diff             @@
##           develop    #1450      +/-   ##
===========================================
- Coverage    94.37%   94.36%   -0.02%     
===========================================
  Files           78       78              
  Lines         4678     4685       +7     
  Branches       934      937       +3     
===========================================
+ Hits          4415     4421       +6     
  Misses         121      121              
- Partials       142      143       +1

Impacted Files	Coverage Δ
samtranslator/model/eventsources/push.py	90.75% <100%> (+0.03%)	⬆️
samtranslator/open_api/open_api.py	93.51% <80%> (-0.38%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 8121fcc...2b19aa1. Read the comment docs.