Add image is close test helper #1244
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This adds a new test helper function
assert_image_closeto assert that twoImages are close using their RGBA components. This is used straightaway intest_shadefor which an increased tolerance was added on GPU in #1129 and I have observed similar differences recently on macOS arm64 with latestnumbaandnumpy. The test happens to have a value very near halfway between two integers so slightly different rounding can occur.