Add NodeJS data loader to JS Movies example

[lmangani]

The NodeJS examples requires python to load the data (although the package.json suggests a js script already existed?) This simple loader should produce the same outcome as the python one for pure NodeJS execution of the example.

Testing needed!

[weaviate-git-bot]

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[lmangani]

I agree with the CLA

[bobvanluijt]

Thanks for the contribution @lmangani!

Hi @sebawita – can you review, please?

[lmangani]

Thanks for accepting the contribution and for the great project!