Add support for StringDtype (fixes #1237) #1339

Job	Run time
initialize	4s
build_pyodide (ubuntu-20.04)	30m 39s
build_js (ubuntu-20.04, 3.9, 18.x)	15m 59s
lint_python (ubuntu-20.04, 3.9)	4m 48s
test_js (ubuntu-20.04, 3.9, 18.x)	12m 37s
build_python (ubuntu-20.04, 3.9, 2014, 18.x, false, false)	23m 14s
benchmark_js	0s
test_js_and_python (ubuntu-20.04, 3.9, 18.x)	5m 18s
test_python (ubuntu-20.04, 3.9, 18.x, false, false)	5m 24s
benchmark_python	0s
test_python_sdist	0s
publish	0s
	1h 38m 3s

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