[Feature Request] Expose proxy username, password and customTag in connectionClosed event

[geminigeek]

hi,

i am requesting username, password and customTag to be exposed in "connectionClosed" event

use case: with this we can log traffic stats by username in an external db

some thing like this

// Emitted when HTTP connection is closed
server.on('connectionClosed', ({ connectionId, stats, username, password, customTag }) => {
  console.log(`Connection ${connectionId} closed`);
  console.dir(stats);
// save stats to a file or db with user name here
});