[whatwg/url] Needs to ignore repeated slashes in file URL (#232)

Hello!

Since the file state doesn't have a way to jump to the special authority slashes state, once the code enters into the file state, repeated slashes in the beginning of a file URL(e.g. `file://///foo/bar` should be `file:///foo/bar`) can't be ignored.

To cover the case, it could be done by the following steps:

1. In scheme state, stop jumping to file state directly before checking special authority slashes state.
2. In special authority ignore slashes state, add file state check.
3. In scheme state, add file state check before jumping to special relative or authority state.

Resources:
+ In the bs file, it can be like this: https://github.com/watilde/url/commit/8791dac09a223f7bb2f255ea860f9320ae30ec2f
+ Here is an example impl: https://github.com/watilde/node/commit/247f960f7125c1dfd24599a3800117d19e4ccb55

What do you think?

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