Send group mail from Contacts Label cause app to crash

Root cause is because onActivityResult for RESULT_GROUP_ADD_MEMBER
is processed for startActivityForResult with RESULT_SEND_TO_SELECTION.

Define the following two Request codes as different values by moving
RESULT_GROUP_ADD_MEMBER to GroupUtil class and giving
RESULT_SEND_TO_SELECTION a new value.

Bug: Not yet
Test: Manual
Co-authored-by: Mattias Nilsson <mattias.nilsson@sony.com>
Change-Id: I728347e01f6f4ba0f129b39448cfcd8580c59965