Add carrier regex config values for VisualVoicemailSmsFilter

Verizon requires all SMS that starts with "//VZWVVM" to be treated
as a VVM SMS.

EXTRA_VOICEMAIL_SMS_MESSAGE_BODY is also added to VociemailContract
to send the message body of a SMS that matches the carrier regex but
is not parsable.

Bug: 30954955
Change-Id: Ib5449164a5290b132648cc28b1e1d3d9ddd5fea0
(cherry picked from commit ad31603b)