Implementation of premium sms metrics.

Changing "/data/misc/sms/metadata" file permissions so that
SmsUsageMonitor.java can read sms_short_codes.xml file version.

Bug: 243187341
Test: atest com.android.internal.telephony.metrics.MetricsCollectorTest
      atest com.android.internal.telephony.metrics.PersistAtomsStorageTest
      atest CtsTelephonyTestCases
Change-Id: I2d62fcc1b8d5452350a481c60c740bd2a20e5ecd