feat: allow lambda ARN to be used for deployment hooks

[AkiraJ48]

Proposed changes

Currently you cannot specify an ARN for the deployment hooks preTrafficHook and postTrafficHook. The deployment hooks only expect a resource name that should exist within the cloudformation stack.

This change will allow us to have a single global lambda that will be invoked by code deploy instead of needing a lambda per cloudformation stack.

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

I opted for a relatively simple check on whether the given input is an ARN. Happy to introduce something like @aws-sdk/util-arn-parser instead if that's preferable.

[AkiraJ48]

Hi @davidgf, when you have time could you please take a look at this PR 😄 ?

[AkiraJ48]

Hi @davidgf sorry for bothering you, have you had some time to look at this PR?