ExtensionArray.Round method and tests #23939

Job	Run time
python-dev	-1s
Linux-32-bit	18m 29s
Linux-Musl	15m 31s
Pyodide build	23m 38s
windows-latest actions-312.yaml	37m 28s
macos-13 actions-310.yaml	46m 34s
macos-14 actions-311.yaml	29m 6s
macos-13 actions-313.yaml	1h 2m 55s
windows-latest actions-313.yaml	43m 41s
windows-latest actions-311.yaml	41m 39s
macos-13 actions-312.yaml	36m 30s
macos-14 actions-310.yaml	34m 8s
macos-13 actions-311.yaml	40m 4s
macos-14 actions-312.yaml	28m 22s
macos-14 actions-313.yaml	30m 53s
windows-latest actions-310.yaml	36m 49s
Locale: zh_CN	24m 29s
ubuntu-24.04 actions-310.yaml	48m 46s
Freethreading	21m 57s
ubuntu-24.04-arm actions-313.yaml	36m 26s
ubuntu-24.04 actions-313.yaml	47m 10s
ubuntu-24.04-arm actions-310.yaml	37m 20s
Pypy	1m 39s
Downstream Compat	8m 1s
Numpy Dev	17m 21s
Minimum Versions	24m 15s
Pyarrow Nightly	20m 57s
ubuntu-24.04 actions-311.yaml	44m 58s
ubuntu-24.04 actions-312.yaml	44m 28s
ubuntu-24.04-arm actions-312.yaml	36m 10s
ubuntu-24.04-arm actions-311.yaml	36m 30s
Future infer strings (without pyarrow)	41m 54s
Future infer strings	47m 18s
Locale: it_IT	25m 9s
	18h 10m 34s

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