feat(core): enable additional metadata collection (under feature flag)

[GavinZZ]

Issue # (if applicable)

Closes #.

Reason for this change

Expand the scope of usage data collected by the AWS CDK to better inform CDK development and improve communication for security concerns and emerging issues. Currently, for those that opt in, the CDK collects usage data on your CDK version and which L2 constructs you use. For more information on current CDK behavior, see Version Reporting.

This proposal expands the scope of usage data collection to include the following from L2 constructs in CDK applications:

• Property keys - Collect which property keys you use from the L2 constructs in your app. This includes property keys nested in dictionary objects.
• Property values of Boolean and enum types - Collect property key values of only Boolean and enum types. All other types, such as string values or construct references will be redacted.
• Method name, keys, and property values of Boolean and ENUM types - When you use an L2 construct method, we will collect the method name, property keys, and property values of of Boolean and enum types

Description of changes

Update CDK synthesis code to additionally handle resource metadata.

On feature flag set to true, synthesis will not only inject Metadata usage like version and construct name, it will additionally look for any construct/method/feature flag metadata injected during resource creation.

Note that this PR is only part one so we will have follow up PRs to add metadata injection during resource creation.

On feature flag set to false, it should be the same as before.

Describe any new or updated permissions being added

N/A

Description of how you validated changes

New unit tests added.
New integration tests added.

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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

[GavinZZ]

Temporarily change the target branch to main to trigger integration tests.

Note that adding import statements and this.node.addMetadata(...) statement to Resources' constructor will be in separate PR.
Currently, this will redact ENUM values as well. We do want to keep ENUM values un-redacted, but this will come as a future change.

[aws-cdk-automation]

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