Add new op HEATMAP_MAX_KEYPOINT.

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

Create tests for the new op. The testcases are verified by execution on
Caffe2 lib with the same op. Generate cts/vts tests.

Bug: 113562572

Test: NeuralNetworksTest_static
Change-Id: I75c8edbe93bf862b87866024eeb1bad8bb9be3dc
Merged-In: I75c8edbe93bf862b87866024eeb1bad8bb9be3dc
(cherry picked from commit 012748d5ae792f83c1bfc971ea820d3e4fb63553)
15 files changed