Allows greater flexibility in serializer to be used

[thompson-tomo]

Why do we need this improvement?

Allow for greater flexibility

How will this change help?

Allows for integration of addtional serializers and possibly reduction in need of Newtonsoft

Screenshots

No response

How could it be implemented/designed?

• Implementation of a AsyncAPI.Saunter.Abstractions packages
• Move NewtonsoftAsyncApiDocumentSerializer.cs into standalone package
• Implementation of the System.Text.Json Serializer

🚧 Breaking changes

Yes

[VisualBean]

Asyncapi.net uses system.text.json, so this will also be solved by the migration to asyncapi.net