[NUI] Add FullScreenMode to InputMethodContext

[wonrst]

To support full screen mode of the input panal.

https://review.tizen.org/gerrit/c/platform/core/uifw/dali-adaptor/+/318558
https://review.tizen.org/gerrit/c/platform/core/uifw/dali-csharp-binder/+/318559

/**
 * @typedef Ecore_IMF_Input_Hints
 * @brief Enumeration for defining the types of Ecore_IMF Input Hints.
 * @since 1.12
 */

typedef enum
{
   ECORE_IMF_INPUT_HINT_NONE                = 0,        /**< No active hints @since 1.12 */
   ECORE_IMF_INPUT_HINT_AUTO_COMPLETE       = 1 << 0,   /**< Suggest word auto completion @since 1.12 */
   ECORE_IMF_INPUT_HINT_SENSITIVE_DATA      = 1 << 1,   /**< Typed text should not be stored. @since 1.12 */
   ECORE_IMF_INPUT_HINT_MULTILINE           = 1 << 2,   /**< Multiline text @since 1.18 */
+   ECORE_IMF_INPUT_HINT_FULLSCREEN_MODE     = 1 << 3,   /**< The input panel should be shown in fullscreen mode @since 1.28 */
...
} Ecore_IMF_Input_Hints;

[TizenAPI-Bot]

Internal API Changed

Added: 1, Removed: 0, Changed: 0

Added

+ /// <since_tizen>none</since_tizen
+ [EditorBrowsable(EditorBrowsableState.Never)]
+ System.Boolean Tizen.NUI.InputMethodContext::FullScreenMode()

[everLEEst]

Looks good to me.