Create conversions to/from NNAPI canonical types

This CL creates the following primary sets of functions:
* V1_X::utils::convert(<canonical_type>) -- Converts a canonical type
  to the corresponding HAL version type.
* nn::convert(<V1_X_HAL_type>) -- Converts a HAL version type to the
  corresponding canonical type.
* neuralnetworks::utils::hasNoPointerData -- Indicates if the object
  contains no pointer-based data that could be relocated to shared
  memory.
* neuralnetworks::utils::flushDataFromPointerToShared -- Relocate
  pointer-based data to shared memory.
* neuralnetworks::utils::unflushDataFromSharedToPointer -- Undoes
  `flushDataFromPointerToShared` on a Request object. More
  specifically, `unflushDataFromSharedToPointer` copies the output
  shared memory data from the transformed Request object back to the
  output pointer-based memory in the original Request object.

It also introduces some other minor utility code, including
makeQuantized8PerformanceConsistentWithP, countNumberOfConsumers,
validate, valid, and validatedConvertToCanonical.

Bug: 160667419
Test: mma
Change-Id: I0732e658c1f4ed40cd122f1ca8581fb40b056757

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