Modify AIDLs to include Session.Info

Modifies the IConnectionService.aidl file to include Session.Info
information to pass from Telecom to Telephony, which is used to start
external Sessions in Telephony from Telecom.

Test: Manual testing and Unit Tests pass
Bug: 26571395
Change-Id: Ia09a0abfa13d5167542d4c67465ea9aa1930b58b