full revert on the idea not to allow spaces in PGQ arrow specifications #399

Job	Run time
Python 3.9 Linux	21m 46s
Python 3 Windows (cp310-*, false)	31m 50s
Python 3 Windows (cp312-*, false)	33m 23s
Linux Extensions (linux_amd64_gcc4)	1h 33m 21s
Python 3 Windows (cp313-*, false)	30m 40s
Python 3 OSX	0s
PyPi Release Cleanup	0s
Python 3 Linux (x86_64, cp312-*, manylinux2014, false)	25m 21s
Python 3 Linux (x86_64, cp313-*, manylinux2014, false)	25m 4s
twine-upload	0s
	4h 21m 25s

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