Add a duration that the plans last and don't read to/write from disk for plans. Make non-duration setSubscriptionPlans API deprecated. Test: atest SubscriptionManagerTest, NetworkPolicyManagerServiceTest Bug: 210696427 Change-Id: I93aece78eda324c333fbf9f1adbedcf46e4864f0 Merged-In: I93aece78eda324c333fbf9f1adbedcf46e4864f0