Implement WebSocket service to AsyncAPI generation tool

[Bhashinee]

1. Description: This issue covers the main tasks that will be completed in the WebSocket AsyncAPI generation tool. More information can be found here,

https://docs.google.com/document/d/1xkW_T8slQs201LG2EJyouz3iBxV-0ureVtXCXeANTJw/edit?usp=sharing

Task break down

• [x] Familiarizing Ballerina language
• [x] Familiarizing AsyncAPI
• [x] Propose a design for Ballerina WebSocket code to AsyncAPI conversion
• [x] Initial implementations of the Service to AsyncAPI specification tool
• [x] Add ChannelTests for Ballerina WebSocket service to AsyncAPI generator cmd tool
• [x] Add DataTypeTests for Ballerina WebSocket service to AsyncAPI generator cmd tool
• [x] Add ResponseTests for Ballerina WebSocket service to AsyncAPI generator cmd tool

[Bhashinee]

Need to get this fine-tuned to include it as a build tool.

As the initial step, need to do the following tasks,

• [ ] Update the code to match the new APIs from the Ballerina Lang.
• [x] Update the apicurio version.
• [ ] Update the Ballerina version
• [x] Update the Gradle scripts
• [x] Current build is not passing with spotbugs. Have to fix the code.
• [ ] Check compatibility with AsyncAPI 3.x.