Telephony: SMS over IMS, DO NOT MERGE

ImsSMSDispatcher is part of IccSmsInterfaceManager.
It always receives calls to send sms first and decides
whether to use ims call flow or gsm/cdma based on response
to REQUEST_IMS_REGISTRATION_STATE.
When ims is registered and sms is supported, the request also returns sms format
to use.
In case of sms over ims failure, RIL_REQUEST_IMS_SEND_SMS sets messageRef from RIL_SMS_RESPONSE
of corresponding failed MO SMS, and sets retry field to non-zero. If voice is available, sends
RIL_REQUEST_IMS_SEND_SMS retries with data encoded based on voice tech available.
If voice is not available, sets retry counter to max and skips retries and sends failure
to client.
Bug: 9626411
Change-Id: I87ca9841b4ace931c55e2d379fe6d7589b2dc8a5