Add support for Async API 3.0

[IgorKarpiuk]

Is your feature request related to a problem? Please describe.

Upgrade linting capabilities by adding support for Async API 3.0, complementing existing support for v2.

Describe alternatives you've considered

Do nothing

[lyudmila-petrova]

There is a real pain to bundle asyncapi v3 specification due to $ref resolution logic in @asyncapi/bundler

The only way today is coding. But anyway using asyncapi libraries, each file's first line is asyncapi: 3.0.0