ENH(string dtype): Implement cumsum for Python-backed strings #21988

Job	Run time
Linux-32-bit	3m 24s
Pyodide build	3m 28s
Linux-Musl	3m 25s
python-freethreading	3m 38s
python-dev (macOS-13)	3m 40s
python-dev (macOS-14)	3m 38s
python-dev (ubuntu-22.04)	3m 38s
python-dev (windows-latest)	3m 35s
macos-13 actions-310.yaml	3m 27s
macos-13 actions-311.yaml	3m 27s
macos-13 actions-312.yaml	3m 27s
macos-14 actions-310.yaml	3m 44s
macos-14 actions-311.yaml	3m 41s
macos-14 actions-312.yaml	3m 29s
windows-latest actions-311.yaml	3m 20s
windows-latest actions-312.yaml	3m 21s
windows-latest actions-310.yaml	3m 23s
Minimum Versions	3m 39s
Future infer strings (without pyarrow)	3m 38s
Locale: zh_CN	3m 39s
Locale: it_IT	3m 40s
Downstream Compat	3m 39s
Numpy Dev	3m 39s
Pyarrow Nightly	3m 38s
Future infer strings	3m 40s
Pypy	1m 40s
ubuntu-22.04 actions-310.yaml	3m 39s
ubuntu-22.04 actions-311.yaml	3m 40s
ubuntu-22.04 actions-312.yaml	3m 39s
ubuntu-24.04-arm actions-311.yaml	3m 37s
ubuntu-24.04-arm actions-312.yaml	3m 36s
ubuntu-24.04-arm actions-310.yaml	3m 37s
	1h 52m 25s

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