src: various minor improvements to node_url

Went hunting for possible performance improvements. Didn't find
anything significant but did manage to make a number of style
improvements that bring more in line with style guidelines and
good pratice.

PR-URL: #31651
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

Author: jasnell

src/env.h

@@ -371,6 +371,13 @@ constexpr size_t kFsStatsBufferLength =
   V(type_string, "type")                                                       \
   V(uid_string, "uid")                                                         \
   V(unknown_string, "<unknown>")                                               \
+  V(url_special_ftp_string, "ftp:")                                            \
+  V(url_special_file_string, "file:")                                          \
+  V(url_special_gopher_string, "gopher:")                                      \
+  V(url_special_http_string, "http:")                                          \
+  V(url_special_https_string, "https:")                                        \
+  V(url_special_ws_string, "ws:")                                              \
+  V(url_special_wss_string, "wss:")                                            \
   V(url_string, "url")                                                         \
   V(username_string, "username")                                               \
   V(valid_from_string, "valid_from")                                           \