feat: Add TimeoutInMillis Property to API Event Source

[gracelu0]

Issue #, if available

Feature request discussion: #3287

• Both Global level and Function level support are requested, but only Function level support is implemented in this pull request.

Description of changes

Add TimeoutInMillis Property to API Event Source (currently only supported for HTTP API Event Source).

Example:

MyFunction:
    Type: AWS::Serverless::Function
    Properties:
      Handler: src/handlers/code.handler
      Events:
        MyApiEvent:
          Type: Api  # API Event Source
          Properties:
            Path: /hello
            Method: GET
            TimeoutInMillis: 5000 # Now supported

Description of how you validated changes

Validated with transform tests and integration tests. Transformed template with added TimeoutInMillis property, then deployed it successfully. Added integration test also verifies that the TimeoutInMillis property is set to the expected value from the template.

Checklist

• Adheres to the development guidelines
• Add/update transform tests
  • Using correct values
  • Using wrong values
• Add/update integration tests

Examples?

Please reach out in the comments if you want to add an example. Examples will be
added to sam init through aws/aws-sam-cli-app-templates.

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

[aaythapa]

I think globals can be implemented in this PR too, just to have everything roll out at once. Unless we have a good reason not to?

[gracelu0]

I think globals can be implemented in this PR too, just to have everything roll out at once. Unless we have a good reason not to?

TimeoutInMillis is not a supported global property for HTTP APIs currently (https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/sam-specification-template-anatomy-globals.html), so for consistency I first implemented the function level support.

[xazhao]

LGTM!