Improve generation of TemplateExtension with code action

Given this Qute template:

{book.XXXX}

The code action which generate the template extension method in a new class will look like this:

@io.quarkus.qute.TemplateExtension
public class TemplateExtensions {
	public static String XXXX(org.agoncal.article.qutepanache.Book book) {
		return null;
	}
}

We should improve:

• generate a package but which strategy can ve adopt it to get a package from sources ? In the future perhaps we should have a popup to fill the package + class name of the template extension.
• add a line space after the TemplateExtensions

public class TemplateExtensions {

	public static String XXXX(org.agoncal.article.qutepanache.Book book) {

• generate import of the Book page to avoid using full qualified name in the parameter.

In other words:

package org.acme;

import org.agoncal.article.qutepanache.Book;

@io.quarkus.qute.TemplateExtension
public class TemplateExtensions {

	public static String XXXX(Book book) {
		return null;
	}
}