Switches client code from JS to TS

[walmazacn]

Description

Changes proposed in this pull request:

• switches client code from JS to TS

Related issue(s)

Resolves #3791

[ndricimrr]

As an additional comment, and to make sure all is good. Could you test the new luigi-client (TS based) against our core/examples for different tech Angular, React and the others. Just replace the @luigi-project/client with the client/public to make sure its using that TS bundled JS output.

[JohannesDoberer]

core/examples works as before

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