Re: [heycam/webidl] Propagate active script to callbacks (#902)

Basically, this PR is adding another "incumbent-like thing" that gets propagated in the same way as incumbent: namely, the active script. In particular, the active script's base URL is used for `import()`.

So the example `setTimeout(eval, 0, 'import(`./example.mjs`)');` is about propagating the active script, not about propagating the incumbent. (The incumbent would come into play with an example like `setTimeout(eval, 0, 'postMessage(...)')`.)

So indeed, this is a bit more in @hiroshige-g's area. But, it will likely impact the bindings code, because it will need propagation through Web IDL callback conversion + calling in the same way incumbent currently does.

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