http: improve parser error messages

Include the library-provided reason in the Error’s `message`.

Fixes: https://github.com/nodejs/node/issues/28468

PR-URL: https://github.com/nodejs/node/pull/28487
Reviewed-By: Anto Aravinth <anto.aravinth.cse@gmail.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: Fedor Indutny <fedor.indutny@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

lib/_http_common.js

@@ -239,6 +239,12 @@ function cleanParser(parser) {
   parser._consumed = false;
 }
 
+function prepareError(err, parser, rawPacket) {
+  err.rawPacket = rawPacket || parser.getCurrentBuffer();
+  if (typeof err.reason === 'string')
+    err.message = `Parse Error: ${err.reason}`;
+}
+
 module.exports = {
   _checkInvalidHeaderChar: checkInvalidHeaderChar,
   _checkIsHttpToken: checkIsHttpToken,
@@ -251,5 +257,6 @@ module.exports = {
   methods,
   parsers,
   kIncomingMessage,
-  HTTPParser
+  HTTPParser,
+  prepareError,
 };