feat: implement --build_python_zip pex #1290

Job	Run time
verify-bcr-patches	2s
test / matrix-prep-bazelversion	11s
test / matrix-prep-os	1s
test / test (ubuntu-latest, 7.1.0, ., false)	10m 18s
test / test (ubuntu-latest, 7.1.0, e2e/smoke, true)	5m 25s
test / test (ubuntu-latest, 7.1.0, e2e/smoke, false)	2m 48s
test / test (ubuntu-latest, 7.1.0, e2e/repository-rule-deps, true)	38s
test / test (ubuntu-latest, 7.1.0, e2e/system-interpreter, true)	5m 33s
test / test (ubuntu-latest, 7.1.0, examples/uv_pip_compile, true)	2m 35s
test / test (ubuntu-latest, 6.4.0, e2e/smoke, true)	5m 27s
test / test (ubuntu-latest, 6.4.0, e2e/smoke, false)	2m 49s
test / test (ubuntu-latest, 6.4.0, e2e/repository-rule-deps, true)	5m 31s
test / test (ubuntu-latest, 6.4.0, e2e/system-interpreter, true)	5m 42s
	47m 0s

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