[whatwg/url] "base URL" should be exported (#293)

https://url.spec.whatwg.org/commit-snapshots/703fcd0b92053345582a36b2e4a642ab65df076e/#url-miscellaneous

> A URL can be designated as base URL

This is useful so you can do things like

```
Let |manifestURL| be the result of [=basic URL parser|basic URL parsing=]
|manifestURLString| with [=base URL=] given by |identifierResponse|'s [=response/url=].
```

Currently `[=base URL=]` does not work.

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