Use Pools for noteOp related data objects

... to avoid too frequent allocations of small objects.

There is no pool for NoteOpEvent objects as they are only freed in very
uncommon situation. Hence they are directly reinited instad of going
through a pool.

Test: atest CtsAppOpsTestCases
Bug: 136595429
Change-Id: Ia39ca9682771cbc44ddbeaadc55f7e3f17c86449