fix: migrate to streamx drop readable-stream

[ThaUnknown]

webtorrent/webtorrent#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]

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[DiegoRBaquero]

We should major version this change

[ThaUnknown]

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

[ThaUnknown]

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