feat: Add qualified invoke ARN output

[joshbeard]

Description

Add an output for the qualified_invoke_arn, which is useful for configuring a function with provisioned concurrency.

Motivation and Context

This addresses issue #384

See the AWS docs about using provisioned concurrency with a qualified ARN:

• https://docs.aws.amazon.com/lambda/latest/dg/troubleshooting-invocation.html#troubleshooting-invocation-coldstart
• https://docs.aws.amazon.com/lambda/latest/dg/provisioned-concurrency.html

Breaking Changes

None.

How Has This Been Tested?

• [x] I have updated at least one of the examples/* to demonstrate and validate my change(s)
• [x] I have tested and validated these changes using one or more of the provided examples/* projects
• [x] I have executed pre-commit run -a on my pull request
• [x] Tested with existing "real world" deployment of the module

[bdwellons]

Bumping this MR. We could use it to simplify our TF implementations using provisioned concurrency.

[antonbabenko]

This PR is included in version 4.17.0 :tada:

[github-actions[bot]]

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