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[jira] [Created] (FLINK-9486) Introduce TimerState in keyed state backend

Stefan Richter created FLINK-9486:

             Summary: Introduce TimerState in keyed state backend
                 Key: FLINK-9486
                 URL: https://issues.apache.org/jira/browse/FLINK-9486
             Project: Flink
          Issue Type: Sub-task
          Components: State Backends, Checkpointing
            Reporter: Stefan Richter
             Fix For: 1.6.0

This is the first implementation subtask.

Goal of this PR is to introduce a timer state that is registered with the keyed state backend, similar to other forms of keyed state.

For the {{HeapKeyedStateBackend}}, this state lives on the same level as the {{StateTable}} that hold other forms of keyed state, and the implementation is basically backed by {{InternalTimerHeap}}.

For {{RocksDBKeyedStateBackend}}, in this first step, we also introduce this state, outside of RocksDB and based upon {{InternalTimerHeap}}. This is an intermediate state, and we will later also implement the alternative to store the timers inside a column families in RocksDB. However, by taking this step, we could also still offer the option to have RocksDB state with heap-based timers.

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