feat(api-gateway): support timeoutInMillis for http events

[VirtueMe]

Summary

• Adds support for timeoutInMillis on individual http events to set the API Gateway integration timeout
• Adds support for provider.apiGateway.timeoutInMillis as a default for all events
• Event-level config takes precedence over the provider default

Usage

provider:
  apiGateway:
    timeoutInMillis: 15000 # default for all step function http events

stepFunctions:
  stateMachines:
    hello:
      events:
        - http:
            path: /hello
            method: GET
            timeoutInMillis: 29000 # override per event

Test plan

• should set TimeoutInMillis when timeoutInMillis is provided
• should not set TimeoutInMillis when timeoutInMillis is not provided
• should pass timeoutInMillis from the http event
• should use provider.apiGateway.timeoutInMillis as default when not set on event
• should prefer event-level timeoutInMillis over provider default
• Full test suite passes (432 tests)

Closes #651

🤖 Generated with Claude Code

[zirkelc]

Hey, thanks for the PR! I'm currently on vacation for a few more days, I'll merge and release it as soon as possible!

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/serverless-operations/serverless-step-functions@673

commit: 8e2c562

[VirtueMe]

Hey, thanks for the PR! I'm currently on vacation for a few more days, I'll merge and release it as soon as possible!

Enjoy your vacaction.