Parses an URL (URI) using uri_string:parse/1.

Example:

{% print "https://example.com:8443/foo?a=b#test"|parse_url %}

Gives:

#{fragment => <<"test">>, host => <<"example.com">>,
  path => <<"/foo">>, port => 8443, query => <<"a=b">>,
  scheme => <<"https">>}