src: general C++ cleanup in node_url.cc

- Merge `domain` and `opaque` storage in URL parser:

  This just simplifies the code a bit, having multiple fields
  in an union with the same type is usually just overhead.

- Add move variant of `URLHost::ToString()`:

  This helps avoid unnecessary string copy operations, especially
  since we control the lifetime of `URLHost` objects pretty well.

- Use const refs in node_url.cc where appropriate

- Remove or reduce overly generous `.reserve()` calls:

  These would otherwise keep a lot of unused memory lying around.

- Return return values instead of unnecessary pointer arguments

- Use more common/expressive variable names

- Avoid macro use, reduce number of unnecessary JS strings:

  There’s no reason for `GET`, `GET_AND_SET` and `UTF8STRING` to be
  macros. Also, `GET` would previously create a JS string instance
  for each single call, even though the strings it was called
  with were compile-time constants.

- Avoid unnecessary JS casts when the type of a value is known

- Avoid (commonly unnecessary) copy for whitespace stripping

PR-URL: #19598
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>

src/env.h

@@ -165,11 +165,13 @@ struct PackageConfig {
   V(fingerprint_string, "fingerprint")                                        \
   V(fingerprint256_string, "fingerprint256")                                  \
   V(flags_string, "flags")                                                    \
+  V(fragment_string, "fragment")                                              \
   V(get_data_clone_error_string, "_getDataCloneError")                        \
   V(get_shared_array_buffer_id_string, "_getSharedArrayBufferId")             \
   V(gid_string, "gid")                                                        \
   V(handle_string, "handle")                                                  \
   V(homedir_string, "homedir")                                                \
+  V(host_string, "host")                                                      \
   V(hostmaster_string, "hostmaster")                                          \
   V(ignore_string, "ignore")                                                  \
   V(infoaccess_string, "infoAccess")                                          \
@@ -226,6 +228,7 @@ struct PackageConfig {
   V(order_string, "order")                                                    \
   V(owner_string, "owner")                                                    \
   V(parse_error_string, "Parse Error")                                        \
+  V(password_string, "password")                                              \
   V(path_string, "path")                                                      \
   V(pending_handle_string, "pendingHandle")                                   \
   V(pbkdf2_error_string, "PBKDF2 Error")                                      \
@@ -239,6 +242,7 @@ struct PackageConfig {
   V(produce_cached_data_string, "produceCachedData")                          \
   V(promise_string, "promise")                                                \
   V(pubkey_string, "pubkey")                                                  \
+  V(query_string, "query")                                                    \
   V(raw_string, "raw")                                                        \
   V(read_host_object_string, "_readHostObject")                               \
   V(readable_string, "readable")                                              \
@@ -247,6 +251,7 @@ struct PackageConfig {
   V(rename_string, "rename")                                                  \
   V(replacement_string, "replacement")                                        \
   V(retry_string, "retry")                                                    \
+  V(scheme_string, "scheme")                                                  \
   V(serial_string, "serial")                                                  \
   V(scopeid_string, "scopeid")                                                \
   V(serial_number_string, "serialNumber")                                     \