[clang] [clang-format] Add ObjCSpaceBeforeMethodDeclColon option to control space before Objective-C method return type (PR #170579)

[Björn Schäpers via cfe-commits]

================
@@ -3931,6 +3931,16 @@ struct FormatStyle {
   /// \version 18
   std::vector<std::string> ObjCPropertyAttributeOrder;
 
+  /// Add or remove a space between the '-'/'+' and the return type in
+  /// Objective-C method declarations. i.e
+  /// \code{.objc}
+  ///    false:                      true:
+  ///
+  ///    -(void)method      vs.      - (void)method
+  /// \endcode
+  /// \version 22
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HazardyKnusperkeks wrote:

```suggestion
  /// \version 23
```
It's now 23. :)

https://github.com/llvm/llvm-project/pull/170579