Make methods of IWindowSession oneway as possible

The methods other than below are set to oneway.
 - with returned value or out argument.
 - holds wake lock.
 - paired with another sync method (e.g. addToDisplay and remove).
To reduce potential blocking calls.

Bug: 161781274
Test: CtsWindowManagerDeviceTestCases CtsInputMethodTestCases
Change-Id: Ifbf0e73316d4f2194928cdb8be973ec5ef3ec5c6