feat(api-gateway): support v1 authorizer

[FrankSpitulski]

Proposed changes

this adds support for api gateway v1 authorizers (for http eventsources). right now if you try to use an authorizer that has a canary config api gateway will throw 500 authorizer configuration exceptions.

Types of changes

What types of changes does your code introduce to the plugin?
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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

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• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Further comments

tested only locally, didn't want to change the examples too much since it would mean changing the http event source to a complex type. will change if that's okay.

[davidgf]

Thanks a lot for your contribution @FrankSpitulski, and sorry for the late reply. Before merging this PR, could you please add some unit and integration tests? For the latter, you'd only need to create the service configuration, the original CloudFormation template and the expected outcome. You can see examples of that in the fixtures/ folder. Also, could you please modify the sample project (under example/), so that it includes an example of how to use the new functionality? Thanks!

[FrankSpitulski]

@davidgf I added the example, but I am very much not familiar with CloudFormation. I'm afraid I'll have to leave it here in terms of the CloudFormation template.