Fix import from modern typescript project

[francoisferrand]

Having the generated js files next to ts creates errors in (some) typescript projects.
To avoid it, move all generated files to subfolder lib, including index.js, and point
the package's main to that file.

Issue: HD-4098

[bert-e]

Hello francoisferrand,

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[bert-e]

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[francoisferrand]

/approve

[bert-e]

I have successfully merged the changeset of this pull request
into targetted development branches:

• ✔️ development/1.2

• ✔️ development/1.3

• ✔️ development/1

The following branches have NOT changed:

• development/1.0
• development/1.1

Please check the status of the associated issue HD-4098.

Goodbye francoisferrand.

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