Refactor NN API VTS tests and add v1.1 tests

  - Create VtsHalNeuralnetworksTest_utils module to be shared between
    v1.x tests.
  - Split the existing tests into two categories: basic, and generated.
  - Created v1.1 VTS tests ensuring no regression in existing ML models.

Bug: 63911257
Test: mm
Test: NNAPI VTS tests pass on v1.0 and v1.1 sample drivers

Change-Id: Ic77c90a3a5bbd96b0ce2acd03764dde4b3034cc9