text: Title: Parsing model: Rename `Return` to `ReturnSetting` and `ReturnStatement` to `Return`
  Body: The deprecated `[Return]` setting is currently represented in the parsing model using a `Return` class and the `RETURN` statement is represented as `ReturnStatement`. For consistency with other control structures, it's better to change this so that `Return` represents `RETURN` and `[Return]` is represented by `ReturnSetting`. We already added `ReturnSetting` as a forwards compatible alias for `Return` in RF 6.1 (#4656) exactly for this purpose. The `ModelVisitor` base class also support `visit_ReturnSetting` already now.
  
  In practice this is what needs to be done:
  - Rename `Return` to `ReturnSetting` and remove the current `ReturnSetting` alias.
  - Rename `ReturnStatement` to `Return`.
  - Add `ReturnStatement` alias for backwards compatibility.
  - Add support for `visit_ReturnStatement` to the `ModelVisitor`. It will be called with `Return` nodes if `visit_Return` is missing.
  
  This is a backwards incompatible change and tools working with the parsing model need to be updated. When using `ModelVisitor`, the following code ought to work with all versions. If only RF 6.1 or newer needs to be supported, `visit_Return` isn't needed because Robot will automatically call appropriate `visit_ReturnXxx` method.
  
  ```python
  from robot import __version__ as robot_version
  from robot.api.parsing import ModelVisitor
  
  
  RF7_OR_NEWER = int(robot_version.split('.')[0]) >= 7
  
  
  class Example(ModelVisitor):
  
      def visit_Return(self, node):
          if RF7_OR_NEWER:
              self.visit_ReturnStatement(node)
          else:
              self.visit_ReturnSetting(node)
  
      def visit_ReturnStatement(self, node):
          ...
  
      def visit_ReturnSetting(self, node):
          ...
  ```