feat: implement --build_python_zip pex #1306

Job	Run time
verify-bcr-patches	7s
test / matrix-prep-bazelversion	2s
test / matrix-prep-os	1s
test / test (ubuntu-latest, 7.1.0, ., false)	11m 0s
test / test (ubuntu-latest, 7.1.0, e2e/smoke, true)	5m 56s
test / test (ubuntu-latest, 7.1.0, e2e/smoke, false)	2m 51s
test / test (ubuntu-latest, 7.1.0, e2e/repository-rule-deps, true)	5m 40s
test / test (ubuntu-latest, 7.1.0, e2e/system-interpreter, true)	5m 46s
test / test (ubuntu-latest, 7.1.0, examples/uv_pip_compile, true)	31s
test / test (ubuntu-latest, 6.4.0, e2e/smoke, true)	5m 42s
test / test (ubuntu-latest, 6.4.0, e2e/smoke, false)	3m 2s
test / test (ubuntu-latest, 6.4.0, e2e/repository-rule-deps, true)	5m 59s
test / test (ubuntu-latest, 6.4.0, e2e/system-interpreter, true)	5m 57s
	52m 34s

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