feat: implement --build_python_zip pex #1308

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 43s
test / test (ubuntu-latest, 7.1.0, e2e/smoke, true)	5m 53s
test / test (ubuntu-latest, 7.1.0, e2e/smoke, false)	2m 42s
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 24s
test / test (ubuntu-latest, 7.1.0, examples/uv_pip_compile, true)	25s
test / test (ubuntu-latest, 6.4.0, e2e/smoke, true)	5m 26s
test / test (ubuntu-latest, 6.4.0, e2e/smoke, false)	2m 41s
test / test (ubuntu-latest, 6.4.0, e2e/repository-rule-deps, true)	5m 36s
test / test (ubuntu-latest, 6.4.0, e2e/system-interpreter, true)	5m 37s
	50m 3s

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