Invalid Java class generated for free-form Map data type by use of 'additionalProperties' property

[taotao100]

Describe the bug

Async Generator generates a invalid java class for free-form Map data type through 'additionalProperties' property in schema/model declarations.

How to Reproduce

a sample AsyncAPI looks like this

asyncapi: 2.6.0
info:
  title: Hello world application
  version: '0.1.0'
channels:
  hello:
    publish:
      message:
        payload:
          $ref: "#/components/schemas/keyValueType"

components:
  schemas:
    keyValueType:
      type: object
      additionalProperties: true

by use of AsyncApi/cli Generator like
asyncapi generate fromTemplate ./sample.yaml @asyncapi/java-spring-template -p javaPackage=Exporter.models --output myoutputTest

an invalid java class is generated see its equals-method at last return, this class is not compilable

package Exporter.models.model;

import javax.validation.constraints.*;
import javax.validation.Valid;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonValue;

import java.util.List;
import java.util.Objects;

public class KeyValueType {  

    
    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        KeyValueType keyValueType = (KeyValueType) o;
        return 
    }

...
}

Expected behavior

a valid java class is generated for 'additionalProperties' property to compile

[github-actions]

Welcome to AsyncAPI. Thanks a lot for reporting your first issue. Please check out our contributors guide and the instructions about a basic recommended setup useful for opening a pull request.
Keep in mind there are also other channels you can use to interact with AsyncAPI community. For more details check out this issue.

[taotao100]

Property 'additionalProperties' is available since AsyncAPI 2.0.0 see https://www.asyncapi.com/docs/reference/specification/v2.0.0

[taotao100]

relevant to issue #272

[derberg]

I'm moving it to template repo, as CLI just rungs generation, has no control over the process

[github-actions]

Welcome to AsyncAPI. Thanks a lot for reporting your first issue. Please check out our contributors guide and the instructions about a basic recommended setup useful for opening a pull request.
Keep in mind there are also other channels you can use to interact with AsyncAPI community. For more details check out this issue.

[asyncapi-bot]

🎉 This issue has been resolved in version 1.4.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀