refactor(lavalink)!d-breaking: Moving the current lavalink implementation to v3 folder #2211

Job	Run time
Minimum supported Rust version	1m 43s
Spelling	9s
Format	17s
Test book examples with skeptic	1m 3s
Build docs	50s
Feature combinations	2m 59s
Test	1m 58s
Clippy	1m 16s
Minimal crate versions	37s
	10m 52s

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