Merge changes from topic "nnapi-op-resolver"

* changes:
  Regenerate tests with the recent changes
  Add new op SLICE
  Add float16 support for ARGMAX and ARGMIN
  Replace uses of kOperationNames[type] with getOperationName(type)
  Add OperationValidationTest for ROI_POOLING and ROI_ALIGN.
  Add new op ROI_POOLING.
  Converts examples from global to static local.
  Fix VTS validation test crashes.
  Add new op ABS
  Modify Gather to use OperationResolver
  Add OperationResolver
  Adds float16 support for DEPTHWISE_CONV_2D.
  Adds float16 support for STRIDED_SLICE.
  Adds float16 support for size/shape operations.
  Support inputs with different quantization parameters in CONCATENATION
  Fix types and add missing tests