feat: move coercing to cdk package

[devversion]

• Moves the coercing to the CDK package

Note: The version placeholder in the src/lib/package.json will be replaced automatically if #4962 is merged.

[jelbourn]

LGTM

[jelbourn]

For caretaker: this will need new build rules
(@andrewseguin)

[jelbourn]

Removing "merge-ready" until we release beta.7 (should be today)

[kara]

@devversion Can you rebase, please?

[angular-automatic-lock-bot]

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