Adds custom inspect method for URL

[svnv]

Adds a custom inspection function for the URL class so that some hardcoded properties will always be listed in full.

Eg.

> new URL("http:https://example.com/?");
URL { href: "http:https://example.com/?", origin: "http:https://example.com", protocol: "http:", username: "", password: "", host: "example.com", hostname: "example.com", port: "", pathname: "/", hash: "", search: "?" }

Closes #3124

Using custom inspection function implemented in #2791

[CLAassistant]

All committers have signed the CLA.

[svnv]

Another and slightly more generic approach here would be to add something like this

[customInspectProperties]:["href", "origin" ....]

to the URL class and handle the presentation of those in the console.ts file instead.

[ry]

@kitsonk please review if you have a chance.

[kitsonk]

One thought about the test, but otherwise looks good.

[kitsonk]

Fine for now, but longer term we should think about exporting helper function from console.ts to do consistent formatting and coloring of the output, but that is bigger scope than this PR.

[svnv]

Updated pull request after code review.

[ry]

LGTM - thanks!