[Blinking Text Cursor Setting] Add aconfig flag for configuring the text cursor blink interval

go/android-blinking-text-cursor

Bug: 402134144
Flag: android.view.accessibility.text_cursor_blink_interval
Test: N/A, flag addition.
Change-Id: Ibeac719c567edc00b177fc5d62083636daf9ca2c
1 file changed