feat: add py_image_layer #1356

Job	Run time
verify-bcr-patches	5s
test / matrix-prep-bazelversion	6s
test / matrix-prep-os	1s
test / test (ubuntu-latest, 7.1.0, ., false)	10m 32s
test / test (ubuntu-latest, 7.1.0, e2e/smoke, true)	5m 35s
test / test (ubuntu-latest, 7.1.0, e2e/smoke, false)	3m 4s
test / test (ubuntu-latest, 7.1.0, e2e/repository-rule-deps, true)	5m 31s
test / test (ubuntu-latest, 7.1.0, e2e/system-interpreter, true)	5m 14s
test / test (ubuntu-latest, 7.1.0, examples/uv_pip_compile, true)	23s
test / test (ubuntu-latest, 6.4.0, e2e/smoke, true)	5m 34s
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 35s
test / test (ubuntu-latest, 6.4.0, e2e/system-interpreter, true)	5m 18s
	49m 48s

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