Add new op ROI_ALIGN.

Add reference CPU implementation for ROI_ALIGN with NHWC data layout and
FP32 input data type.

Create tests for both operations. Generate cts/vts tests. Testcases are
verified by execution on Caffe2 lib.

Bug: 113561893

Test: NeuralNetworksTest_static
Change-Id: Id0188a12b801595659ad7017759c5cd2e67e7e88