Reusable execution at HAL level -- HAL.

This CL modifies the canonical/AIDL adapter to use IExecution object
if available.

Bug: 202405342
Bug: 202431255
Test: NNT_static
Test: CtsNNAPITestCases
Test: VtsHalNeuralnetworksTargetTest
Change-Id: I6aac3c57f97ac87a5ba3f78cfd843fcc403decff