Add config for "Share" action in TextView context menu

"Share" text action is not applicable to all platforms, this config
allows disabling the action item.
Example - Automotive (AAOS) does not support it

Bug: 162463255

Test: atest TextViewTest EditTextTest, manual check
Merged-In: I825a85bdf566c0a319bd91b523284757af6be68e
Change-Id: I825a85bdf566c0a319bd91b523284757af6be68e