feat(java): add @return.inner & @return.outer text objects

Make wildcard child node optional to handle `void` return:

```java
class Example {
  private void example() {
    return;
  }
}
```

Author: gbroques

README.md

@@ -370,7 +370,7 @@ Here are some rules about the query names that should be noted.
 <tr>
 <td>inko</td><td><span title="@assignment.inner">🟩</span></td> <td><span title="@assignment.lhs">🟩</span></td> <td><span title="@assignment.outer">🟩</span></td> <td><span title="@assignment.rhs">🟩</span></td> <td><span title="@attribute.inner">⬜</span></td> <td><span title="@attribute.outer">⬜</span></td> <td><span title="@block.inner">🟩</span></td> <td><span title="@block.outer">🟩</span></td> <td><span title="@call.inner">🟩</span></td> <td><span title="@call.outer">🟩</span></td> <td><span title="@class.inner">🟩</span></td> <td><span title="@class.outer">🟩</span></td> <td><span title="@comment.inner">⬜</span></td> <td><span title="@comment.outer">🟩</span></td> <td><span title="@conditional.inner">🟩</span></td> <td><span title="@conditional.outer">🟩</span></td> <td><span title="@frame.inner">⬜</span></td> <td><span title="@frame.outer">⬜</span></td> <td><span title="@function.inner">🟩</span></td> <td><span title="@function.outer">🟩</span></td> <td><span title="@loop.inner">🟩</span></td> <td><span title="@loop.outer">🟩</span></td> <td><span title="@number.inner">🟩</span></td> <td><span title="@parameter.inner">🟩</span></td> <td><span title="@parameter.outer">🟩</span></td> <td><span title="@regex.inner">⬜</span></td> <td><span title="@regex.outer">⬜</span></td> <td><span title="@return.inner">🟩</span></td> <td><span title="@return.outer">🟩</span></td> <td><span title="@scopename.inner">⬜</span></td> <td><span title="@statement.outer">⬜</span></td> </tr>
 <tr>
-<td>java</td><td><span title="@assignment.inner">⬜</span></td> <td><span title="@assignment.lhs">⬜</span></td> <td><span title="@assignment.outer">⬜</span></td> <td><span title="@assignment.rhs">⬜</span></td> <td><span title="@attribute.inner">⬜</span></td> <td><span title="@attribute.outer">⬜</span></td> <td><span title="@block.inner">⬜</span></td> <td><span title="@block.outer">🟩</span></td> <td><span title="@call.inner">🟩</span></td> <td><span title="@call.outer">🟩</span></td> <td><span title="@class.inner">🟩</span></td> <td><span title="@class.outer">🟩</span></td> <td><span title="@comment.inner">⬜</span></td> <td><span title="@comment.outer">🟩</span></td> <td><span title="@conditional.inner">🟩</span></td> <td><span title="@conditional.outer">🟩</span></td> <td><span title="@frame.inner">⬜</span></td> <td><span title="@frame.outer">⬜</span></td> <td><span title="@function.inner">🟩</span></td> <td><span title="@function.outer">🟩</span></td> <td><span title="@loop.inner">🟩</span></td> <td><span title="@loop.outer">🟩</span></td> <td><span title="@number.inner">🟩</span></td> <td><span title="@parameter.inner">🟩</span></td> <td><span title="@parameter.outer">🟩</span></td> <td><span title="@regex.inner">⬜</span></td> <td><span title="@regex.outer">⬜</span></td> <td><span title="@return.inner">⬜</span></td> <td><span title="@return.outer">⬜</span></td> <td><span title="@scopename.inner">⬜</span></td> <td><span title="@statement.outer">⬜</span></td> </tr>
+<td>java</td><td><span title="@assignment.inner">⬜</span></td> <td><span title="@assignment.lhs">⬜</span></td> <td><span title="@assignment.outer">⬜</span></td> <td><span title="@assignment.rhs">⬜</span></td> <td><span title="@attribute.inner">⬜</span></td> <td><span title="@attribute.outer">⬜</span></td> <td><span title="@block.inner">⬜</span></td> <td><span title="@block.outer">🟩</span></td> <td><span title="@call.inner">🟩</span></td> <td><span title="@call.outer">🟩</span></td> <td><span title="@class.inner">🟩</span></td> <td><span title="@class.outer">🟩</span></td> <td><span title="@comment.inner">⬜</span></td> <td><span title="@comment.outer">🟩</span></td> <td><span title="@conditional.inner">🟩</span></td> <td><span title="@conditional.outer">🟩</span></td> <td><span title="@frame.inner">⬜</span></td> <td><span title="@frame.outer">⬜</span></td> <td><span title="@function.inner">🟩</span></td> <td><span title="@function.outer">🟩</span></td> <td><span title="@loop.inner">🟩</span></td> <td><span title="@loop.outer">🟩</span></td> <td><span title="@number.inner">🟩</span></td> <td><span title="@parameter.inner">🟩</span></td> <td><span title="@parameter.outer">🟩</span></td> <td><span title="@regex.inner">⬜</span></td> <td><span title="@regex.outer">⬜</span></td> <td><span title="@return.inner">🟩</span></td> <td><span title="@return.outer">🟩</span></td> <td><span title="@scopename.inner">⬜</span></td> <td><span title="@statement.outer">⬜</span></td> </tr>
 <tr>
 <td>javascript</td><td><span title="@assignment.inner">🟩</span></td> <td><span title="@assignment.lhs">🟩</span></td> <td><span title="@assignment.outer">🟩</span></td> <td><span title="@assignment.rhs">🟩</span></td> <td><span title="@attribute.inner">🟩</span></td> <td><span title="@attribute.outer">🟩</span></td> <td><span title="@block.inner">🟩</span></td> <td><span title="@block.outer">🟩</span></td> <td><span title="@call.inner">🟩</span></td> <td><span title="@call.outer">🟩</span></td> <td><span title="@class.inner">🟩</span></td> <td><span title="@class.outer">🟩</span></td> <td><span title="@comment.inner">⬜</span></td> <td><span title="@comment.outer">🟩</span></td> <td><span title="@conditional.inner">🟩</span></td> <td><span title="@conditional.outer">🟩</span></td> <td><span title="@frame.inner">⬜</span></td> <td><span title="@frame.outer">⬜</span></td> <td><span title="@function.inner">🟩</span></td> <td><span title="@function.outer">🟩</span></td> <td><span title="@loop.inner">🟩</span></td> <td><span title="@loop.outer">🟩</span></td> <td><span title="@number.inner">🟩</span></td> <td><span title="@parameter.inner">🟩</span></td> <td><span title="@parameter.outer">🟩</span></td> <td><span title="@regex.inner">🟩</span></td> <td><span title="@regex.outer">🟩</span></td> <td><span title="@return.inner">🟩</span></td> <td><span title="@return.outer">🟩</span></td> <td><span title="@scopename.inner">⬜</span></td> <td><span title="@statement.outer">🟩</span></td> </tr>
 <tr>

queries/java/textobjects.scm

@@ -27,6 +27,9 @@
     "}"
     (#make-range! "function.inner" @_start @_end)))
 
+(return_statement
+  (_)? @return.inner) @return.outer
+
 (for_statement
   body: (_)? @loop.inner) @loop.outer