Add a config option to specify the deferred selection behavior

[sangmokh]

Background

• When the text-mask set a range selection on Input Element, it uses a deferred selection behavior if navigator.userAgent value has 'Android'.
• However, on a recent version of Android (e.g. Galaxy S9), the deferred selection behavior is unnecessary (if not undesirable). Also on some other OSes (e.g. Tizen), the deferred selection behavior is necessary for text selection to work properly.

Feature Request

• Add a config option to specify the deferred selection behavior as needed to override the default behavior.
• This change is backward-compatible. If deferredSelectionEnabled config option is not specified, the same deferred selection behavior as before should be used.