Resolve API feedback and remove references to SliceStore

Rename PURCHASE_PREMIUM_CAPABILITY_RESULT_NOT_DEFAULT_DATA to
PURCHASE_PREMIUM_CAPABILITY_RESULT_NOT_DEFAULT_DATA_SUB

Split KEY_PREMIUM_CAPABILITY_MAXIMUM_NOTIFICATION_COUNT_INT_ARRAY
into KEY_PREMIUM_CAPABILITY_MAXIMUM_DAILY_NOTIFICATION_COUNT_INT
and KEY_PREMIUM_CAPABILITY_MAXIMUM_MONTHLY_NOTIFICATION_COUNT_INT

Rename SliceStore to SlicePurchaseController. Remove all references to
SliceStore.

Test: atest TelephonyManagerReadNonDangerousPermissionTest
Test: manually verify premium capability purchase behavior
Bug: 255552152
Change-Id: I653db7566c91942faadcec24fb7bb340236ebdc0