Extract AlarmQueue into its own class.

The AlarmQueue concept is used in several areas, so extracting and
centralizing the code to reduce code duplication.

Bug: 141645789
Bug: 194532703
Test: atest CtsJobSchedulerTestCases
Test: atest FrameworksMockingServicesTests:AgentTest
Test: atest FrameworksMockingServicesTests:AlarmQueueTest
Test: atest FrameworksMockingServicesTests:CountQuotaTrackerTest
Test: atest FrameworksMockingServicesTests:MultiRateLimiterTest
Test: atest FrameworksMockingServicesTests:QuotaControllerTest
Change-Id: Ic070ce3c786de32031cc196578f91086bac8121d