Adding Test API to send Memory Status Event For CTS

- Send memory status to SmsStorageMonitor
- Bug: b/255881498

Test: atest CtsTelephonyTestCases:ImsServiceTest
Change-Id: Ifc32053af59c81193b8a47a1ef7d4a839ecfcbf7
(cherry picked from commit 4700b7e73d03cd4fcb29a1956ec453c1af79184a)
4 files changed