feat: add py_image_layer #1352

Job	Run time
verify-bcr-patches	4s
test / matrix-prep-bazelversion	3s
test / matrix-prep-os	1s
test / test (ubuntu-latest, 7.1.0, ., false)	10m 7s
test / test (ubuntu-latest, 7.1.0, e2e/smoke, true)	5m 32s
test / test (ubuntu-latest, 7.1.0, e2e/smoke, false)	2m 47s
test / test (ubuntu-latest, 7.1.0, e2e/repository-rule-deps, true)	5m 28s
test / test (ubuntu-latest, 7.1.0, e2e/system-interpreter, true)	5m 26s
test / test (ubuntu-latest, 7.1.0, examples/uv_pip_compile, true)	2m 38s
test / test (ubuntu-latest, 6.4.0, e2e/smoke, true)	5m 42s
test / test (ubuntu-latest, 6.4.0, e2e/smoke, false)	2m 50s
test / test (ubuntu-latest, 6.4.0, e2e/repository-rule-deps, true)	5m 32s
test / test (ubuntu-latest, 6.4.0, e2e/system-interpreter, true)	5m 37s
	51m 47s

Provide feedback