[w3c/webcomponents] [templates] implement a polyfill of template-instantiation before even considering to add the API natively to the platform (#702)

It isn't clear what all features are needed for template instantiation, and looks like at least https://github.com/w3c/webcomponents/blob/gh-pages/proposals/Template-Instantiation.md proposal should be rather polyfillable, so it would be good to have a library to play with before deciding to add such a complicated API to the platform.
(We've managed to done rather bad job with web components before, so need to be careful to not repeat the mistakes, like shipping "v0" and then "v1")

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https://github.com/w3c/webcomponents/issues/702