Feature/dynamic import preloading

[AjayPoshak]

Related to #94

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[surma]

@AjayPoshak I’ll push my changes for the Rollup plugin later today. Can you address the other points in the meantime?

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[surma]

@AjayPoshak I pushed my Rollup changes. Feel free to address the last couple comments and we can get this merged :)

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