Add minimal support for v3 code generation

[fmvilas]

Scope

• [x] https://github.com/asyncapi/java-spring-cloud-stream-template/issues/336
• [x] https://github.com/asyncapi/java-spring-template/issues/308
• [x] https://github.com/asyncapi/java-template/issues/118
• [x] https://github.com/asyncapi/nodejs-template/issues/215
• [x] https://github.com/asyncapi/python-paho-template/issues/189

All templates

The following is a list of all the templates that eventually would have to be migrated. This is not the scope of this issue but I'm pasting it here just for reference.

• https://github.com/asyncapi/dotnet-nats-template/issues/384
• https://github.com/asyncapi/go-watermill-template/issues/243
• https://github.com/asyncapi/java-spring-cloud-stream-template/issues/336
• https://github.com/asyncapi/java-spring-template/issues/308
• https://github.com/asyncapi/java-template/issues/118
• https://github.com/asyncapi/nodejs-template/issues/215
• https://github.com/asyncapi/nodejs-ws-template/issues/294
• https://github.com/asyncapi/python-paho-template/issues/189
• https://github.com/asyncapi/ts-nats-template/issues/545

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