feat: implement --build_python_zip pex #1194

Job	Run time
verify-bcr-patches	2s
test-release	31s
test / matrix-prep-bazelversion	8s
test / matrix-prep-os	1s
test / test (ubuntu-latest, 7.0.2, ., false)	1m 44s
test / test (ubuntu-latest, 7.0.2, e2e/smoke, true)	5m 34s
test / test (ubuntu-latest, 7.0.2, e2e/smoke, false)	2m 30s
test / test (ubuntu-latest, 7.0.2, e2e/repository-rule-deps, true)	5m 14s
test / test (ubuntu-latest, 7.0.2, e2e/system-interpreter, true)	5m 33s
test / test (ubuntu-latest, 6.4.0, e2e/smoke, true)	3m 16s
test / test (ubuntu-latest, 6.4.0, e2e/smoke, false)	3m 0s
test / test (ubuntu-latest, 6.4.0, e2e/repository-rule-deps, true)	3m 16s
test / test (ubuntu-latest, 6.4.0, e2e/system-interpreter, true)	3m 17s
	34m 6s

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