Updating ISms interface and SmsManager to allow retrieving WAP push message size

As part of the effort to support MMS over satellite, we want to limit
the size of MMS that can be downloaded while using a satellite
connection. This cl adds a new method signature for getWapMessageSize to
ISms interfaces and SmsManager so that in
frameworks/opt/telephony we can add the implementation of
getWapMessageSize to SmsController. In the future, the message size will
be retrieved during MMS download and if it exceeds some threshold the
download will be prevented.

Test: tests added in other topic cl

Bug: 311244479

Change-Id: I6adc85d504f88dcabddc7c982e7c494498311d37