Include Return Type Annotations in Method Hover Tooltip

Description
When hovering over a method in the editor, the tooltip currently shows the method signature and Javadoc (if available). However, annotations applied to the method’s return type are not displayed.

This feature request proposes enhancing the hover tooltip to include annotations declared on the return type.

Example

public @Nullable String getName() {
    return name;
}

or with type-use annotations:

public List<@NonNull String> getNames() {
    return names;
}

Current Behavior:
Hover tooltip shows:

String getName()

Expected Behavior:
Hover tooltip shows:

@Nullable String getName()

and for generics:

List<@NonNull String> getNames()

Motivation / Use Case
Return type annotations (e.g., nullability annotations like @Nullable, @NonNull, or custom type-use annotations) are critical for understanding API contracts, static analysis, and preventing runtime errors.

Not displaying them in hover:

• Hides important semantic information
• Forces developers to navigate to the declaration
• Reduces the usefulness of hover as a quick inspection tool

Comienza por localizar la implementación de Java del tooltip de hover en la extensión de VS Code y rastrear cómo se representan las firmas de los métodos. Usa los ejemplos @Nullable y List<@NonNull String> como casos esperados; la tarea estará terminada cuando tanto las anotaciones de retorno de declaración como las de uso de tipo aparezcan en la salida del hover, y se hayan añadido o actualizado las pruebas correspondientes.