apidom-ls: all AsyncAPI 2.0 rules lint/completion/docs must be scoped

[char0n]

All rules needs to be scoped explicitly using exports from target-specs.ts

If existing rules don't have any scoping AsyncAPI2 MUST be used.
If existing rules have existing scoping rules, then must be replaced with symbols from target-specs.ts.

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This is required, before any AsynAPI 3.x.y work can even begin.