Fixed out of memory when running telephony unit tests

1. Temporarily increased the heap size so the unit tests can use more
   than 192MB of memory.
2. Enabled strict mode in TelephonyTest to detect resource leaks.
3. Fixed the resource leaks in carrier resolver and emergency number
   tracker.
4. Fixed the resource leak in InboundSmsTrackerTest.
5. Temporarily disabled EmergencyNumberTrackerTest and
   ImsRttTextHandlerTest, which caused resource leaks after enabling
   strict mode.

Bug: 221655014
Test: acloud create && atest FrameworksTelephonyTests
Change-Id: Ib8e37aa5b62e56f246063f820a848c3373965b72