refactor(cli): generate yargs configuration from TS

[comcalvi]

Issue # (if applicable)

N/A

Reason for this change

We'd like to create a programmatic interface to the CDK Toolkit. A bonus of this overhaul is moving to a single source of truth for both the programmatic interface to the CDK Toolkit and the command line interface to the CDK Toolkit. This PR generates the existing yargs configuration from a TS configuration. In the long term, we'd generate the yargs configuration purely from the programmatic interface to the Toolkit, but this is an improvement with less effort.

Description of changes

Creates a new package, @aws-cdk/yargs-gen, which generates our yargs configuration from a CliConfig defined in aws-cdk/config.ts using @cdklabs/typewriter.

Description of how you validated changes

N/A yet.

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

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[mrgrain]

I'm a inclined the check the generated code in for visibility and reviewability. WDYT?

[comcalvi]

My first instinct was to follow the codegen pattern we have for L1s, which is to ignore them, but the nature of the yargs code is very different from that of the L1s, so I agree that checking this file in is good. I've added it.

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: f7a09b0
• Result: SUCCEEDED
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