errors: port internal/fs errors to internal/errors

* Assign codes to errors reported by internal/fs.js

PR-URL: https://github.com/nodejs/node/pull/11317
Refs: https://github.com/nodejs/node/issues/11273
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Franziska Hinkelmann <franziska.hinkelmann@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>

lib/internal/errors.js

@@ -142,6 +142,8 @@ E('ERR_INVALID_OPT_VALUE',
   (name, value) => {
     return `The value "${String(value)}" is invalid for option "${name}"`;
   });
+E('ERR_INVALID_OPT_VALUE_ENCODING',
+  (value) => `The value "${String(value)}" is invalid for option "encoding"`);
 E('ERR_INVALID_REPL_EVAL_CONFIG',
   'Cannot specify both "breakEvalOnSigint" and "eval" for REPL');
 E('ERR_INVALID_SYNC_FORK_INPUT',