ENH(string dtype): Implement cumsum for Python-backed strings #21989

Job	Run time
Pyodide build	1m 27s
Linux-32-bit	1m 15s
Linux-Musl	1m 17s
python-freethreading	1m 15s
python-dev (macOS-14)	1m 18s
python-dev (ubuntu-22.04)	1m 15s
python-dev (macOS-13)	1m 15s
python-dev (windows-latest)	1m 6s
macos-13 actions-311.yaml	1m 13s
macos-13 actions-310.yaml	1m 15s
macos-13 actions-312.yaml	1m 13s
macos-14 actions-310.yaml	58s
macos-14 actions-311.yaml	1m 11s
macos-14 actions-312.yaml	1m 9s
windows-latest actions-311.yaml	1m 15s
windows-latest actions-312.yaml	1m 17s
windows-latest actions-310.yaml	55s
Minimum Versions	1m 6s
Future infer strings (without pyarrow)	1m 9s
Locale: zh_CN	1m 1s
Locale: it_IT	1m 1s
Downstream Compat	1m 9s
Numpy Dev	59s
Pyarrow Nightly	1m 9s
Future infer strings	1m 8s
Pypy	1m 19s
ubuntu-22.04 actions-310.yaml	1m 0s
ubuntu-22.04 actions-312.yaml	1m 2s
ubuntu-22.04 actions-311.yaml	1m 7s
ubuntu-24.04-arm actions-311.yaml	1m 1s
ubuntu-24.04-arm actions-312.yaml	1m 4s
ubuntu-24.04-arm actions-310.yaml	1m 2s
	36m 51s

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