feat(provider-generator): use lazy loading of generated provider namespaces

[DanielMSchmidt]

Waiting on aws/jsii#4181 to be merged and released

TODO

• We might not need a package.json to be emitted, but we need to change jsii-srcmak to add an exports map for "." in the package.json it creates
• The lazy index require calls need to be made to ./dirName instead of dirName
• test that we take the right dir name for providers with renames / dashes

[github-actions]

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