JavaGenerator and JavaFileGenerator has too different arguments

[Tenischev]

Reason/Context

I observed the strange difference between how JavaGenerator and JavaFileGenerator are instanced and used.
Issue found during exploration of possibility to use Modelina for model generation in Java spring template, see #asyncapi/java-spring-template#342
In case of JavaGenerator:

const generator = new JavaGenerator({
  collectionType: "List",
  presets: [
    {
      preset: JAVA_COMMON_PRESET,
      options: {
        classToString: true
      }
    }
  ]
});

// const input = ...AsyncAPI document
const models = await generator.generate(input)

In case of JavaFileGenerator:

        const javaGenerator = new modelina.JavaFileGenerator();

        javaGenerator.generateToFiles(generator.asyncapi, path.resolve(generator.targetDir, 'src/main/java/com/asyncapi/modelina/'), {
            collectionType: "List",
            presets: [
                {
                    preset: modelina.JAVA_COMMON_PRESET,
                    options: {
                        equal: true,
                        hashCode: true,
                        classToString: true
                    }
                }
            ]
        }, true)

So, difference in how options are passed.

Description

I would expect similar way to create an instance of JavaGenerator and JavaFileGenerator. Thus JavaFileGenerator is instanced with options and generateToFiles method is not require them. This means, that AbstractFileGenerator interface also should be changed.

During Slack discussion there was argument from @jonaslagoni that options are passed to generateToFiles because of package name which is related to outputPath.
But for Java class it would be incorrect if outputPath not match with package name.
Thus, additionally I would suggest to use following logic to determine destination path where files will be stored:
resultPath = outputDir + packageName
e.g.
outputDir = "generated-source"
packageName = "com.asyncapi.template.java"
then
resultPath = generated-source/com/asyncapi/template/java

[github-actions]

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