CameraService: Add unit tests for DistortionMapper

- Make cameraserver_test test module reachable by build system
- Fix minor compilation error in CameraProviderManagerTest
- Add tests to verify:
  - Initialization of DistortionMapper
  - Transforms with an identity distortion function
  - Round-trip transform ~1e6 points with a large distortion function
  - Raw to corrected transform compared against OpenCV undistortPoints,
    using python to generate the comparison coordinate lists as a C++
    header

Test: atest cameraservice_test
Bug: 79885994
Change-Id: Iae3d6f9de2e6c79dd5cea5ca35ee5100b38441f4