feat(secretsmanager): create secret with secretObjectValue

[corymhall]

A common use case is to create key/value secrets where the values could
be either strings or other secret values. Currently this is possible,
but the user experience is not great. This PR introduces a new input
prop secretObjectValue which is of type { [key: string]: SecretValue }.

For example, you can now create a JSON secret:

new secretsmanager.Secret(stack, 'JSONSecret', {
  secretObjectValue: {
    username: SecretValue.unsafePlainText(user.userName), // intrinsic reference, not exposed as plaintext
    database: SecretValue.unsafePlainText('foo'), // rendered as plain text, but not a secret
    password: accessKey.secretAccessKey, // SecretValue
  },
});

I've also updated the docs to better reflect what unsafe means given
this new context.

fixes #20461

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[gitpod-io]

[mrgrain]

LGTM

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[aws-cdk-automation]

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• Commit ID: 6101708
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[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).