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During multi-step text input composing, such as with Chinese, Japanese, and Korean text input, the framework sends embedders cursor rect updates in the form of two messages: * TextInput.setMarkedTextRect: notifies the embedder the size and position of the composing text rect (or cursor when not composing) in local coordinates. * TextInput.setEditableSizeAndTransform: notifies the embedder of the size of the EditableText and 4x4 transform matrix from local to PipelineOwner.rootNode coordinates. On receipt of either message, we cache a local copy on the TextInputPlugin and notify the Win32FlutterWindow of the updated cursor rect. In a followup patch, we update Win32FlutterWindow to implement the Win32 input manager (IMM) calls required to position the IME candidates window while editing.