fix: migrate to streamx drop readable-stream

https://github.com/webtorrent/webtorrent/issues/1971

the echo server no longer exists, and no services like it exist, so instead we create a server ourselves.

streamx uses "objectMode" by default as it doesn't force Buffer, so I re-implemented forced buffer mode, encoding doesn't exist on streamx, so I changed the test to objectMode as it's pretty much the same result.

Socket Security Pull Request Report

👍 No new dependency issues detected in pull request

Pull request report summary

Issue	Status
Install scripts	✅ 0 issues
Native code	✅ 0 issues
Bin script confusion	✅ 0 issues
Bin script shell injection	✅ 0 issues
Network access	✅ 0 issues
Unresolved require	✅ 0 issues
Invalid package.json	✅ 0 issues
HTTP dependency	✅ 0 issues
Git dependency	✅ 0 issues
GitHub dependency	✅ 0 issues
Potential typo squat	✅ 0 issues
Known Malware	✅ 0 issues
Telemetry	✅ 0 issues
Protestware/Troll package	✅ 0 issues
AI detected malware	✅ 0 issues

Bot Commands

To ignore an alert, reply with a comment starting with @SocketSecurity ignore followed by a space separated list of package-name@version specifiers. e.g. @SocketSecurity ignore [email protected] [email protected]

Powered by socket.dev

We should major version this change

I'm not certain this PR is correct fyi, as end might not fire on .destroy() with this? not 100% sure, asked mafintosh on feedback but he's ghosting too

after testing, this is pretty much safe to merge, causes no issues anywhere