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

Start by locating the Java hover-tooltip implementation in the VS Code extension and tracing how method signatures are rendered. Use the @Nullable and List<@NonNull String> examples as the expected cases; done means both declaration and type-use return annotations appear in the hover output, with corresponding tests added or updated.