Adds moveWindowMagnifierToPosition method

For following typing focus feature, we add a
moveWindowMagnifierToPosition method for a window magnifier to move it
to the center of onRectangleOnScreenRequested.

Apart from calling this method to fulfill movement functionality, we can
separate the movement from calling enableWindowMagnification which is a
temporary replacement for movement functionality. Therefore, we can
distinguish whether the it is enabled by the first time or the further
movement behavior. It would help us differentiate the condition whether
we should reset the following typing focus to on/off state. (b/216394179)

Bug: 219654280
Test: atest IWindowMagnificationConnectionTest
      atest WindowMagnificationTest
      atest WindowMagnificationAnimationControllerTest
      atest WindowMagnificationControllerTest
      atest WindowMagnificationConnectionWrapperTest
      atest WindowMagnificationManagerTest
Change-Id: Iaac3ca6868d948571c1aee54a5f122c9697059d8