Add support for AsyncAPI 2.3.0

[char0n]

asyncapi/spec@v2.2.0...v2.3.0

Release article: https://www.asyncapi.com/blog/release-notes-2.3.0

TODO:

• refactor: provide context to replace empty plugins #1150
• refactor(asyncapi): unify how we work with media types #1145
• refactor(openapi): unify how we work with media types #1146
• Operation.message fixed field type
• New solace bindings object
• Support for solace bindings in replace empty plugin
• Specification objects for bindings live on master branch now
• Test for 2.3.0 spec version with new additions
• New fields in Components Object
• Change versioning to 2.3.0

Changes

Operation.message fixed field type

New solace bindings object

https://github.com/asyncapi/bindings/tree/master/solace

New fields in Components Object

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Bug and unclarity was found in new AsyncAPI 2.3.0 spec and was reported here: asyncapi/spec#705