Consider upgrading the code to be supported by AsyncAPI Parser-JS v2

[smoya]

Reason/Context

Parser-JS 2.0 (released as rc at this moment) is a completely new parser, with a lot of changes. The bigger ones are:

• Completely rewritten to TS.
• Implements the new parser-api, in particular, the version found in this PR.
• Uses Spectral as parser/linter with the AsyncAPI ruleset.
• Lots of other improvements, especially around Developer Experience.

Considering that Spectral now validates the documents before parsing, we had to update the interface for Schema parsers to separate validation from parsing. This change also introduced better errors and the way we handle them. (see this issue and related).

Description

• Implement the new Parser-JS 2.0 Schema Parser Interface.

Note that Parser-JS v2 uses TypeScript so feel free to use it as well.

[smoya]

Closing in favor of asyncapi/protobuf-schema-parser#46