feat: implement --build_python_zip pex #1303

Job	Run time
verify-bcr-patches	3s
test / matrix-prep-os	1s
test / matrix-prep-bazelversion	3s
test / test (ubuntu-latest, 7.1.0, ., false)	2m 10s
test / test (ubuntu-latest, 7.1.0, e2e/smoke, true)	1m 58s
test / test (ubuntu-latest, 7.1.0, e2e/smoke, false)	2m 3s
test / test (ubuntu-latest, 7.1.0, e2e/repository-rule-deps, true)	1m 58s
test / test (ubuntu-latest, 7.1.0, e2e/system-interpreter, true)	2m 0s
test / test (ubuntu-latest, 7.1.0, examples/uv_pip_compile, true)	23s
test / test (ubuntu-latest, 6.4.0, e2e/smoke, true)	1m 59s
test / test (ubuntu-latest, 6.4.0, e2e/smoke, false)	2m 1s
test / test (ubuntu-latest, 6.4.0, e2e/repository-rule-deps, true)	1m 59s
test / test (ubuntu-latest, 6.4.0, e2e/system-interpreter, true)	2m 0s
	18m 38s

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