Unify URL parsing with GoogleURL

[asraa]

Two concerns:

• llhttp (http-parser replacement) does not have a URL parser: Any plan to add URL parser? nodejs/llhttp#7. Derek brought up this concern in that issue.
• The fewer different URL parsing stuff we have, the better.

Envoy uses http_parser_url to split the URL into pieces.

We should replace this with GoogleURL, which does URL parsing (https://chromium.googlesource.com/chromium/src/+/master/url#parsing). See
https://chromium.googlesource.com/chromium/src/+/master/url/gurl.h#340

Related Issues:
#5155
#6588

Can we bring back #11670?

cc @derekargueta @dio @envoyproxy/security-team

[dio]

I think @yanavlasov has a relevant plan for this, I'll try to propose something, but it will be good to hear from Yan first :).