Improve text input

* Improve inputting Korean
* Improve log to be useful for development
* Improve the readability of filter event
* Set more status to edit text properly
* Delete preedit text more appropriately
* Add DeviceProfile
* Removed the resizing code that was blocked for a while
  Please re-implement it, when the problem is fully identified
  and solved. See flutter-tizen#28 for more details

When using ecore-imf, disappointingly, The behavior of
several factors related to text input in each device profile
is different(such as key-event, calling callbacks for imf).
So I've fine-tuned it, but this may not be the best.
Maybe it's better to separate it by profile in the future.

Signed-off-by: Boram Bae <boram21.bae@samsung.com>