Integrate BoundedReaderPool into PyGrain to support thread-safe, concurrent data loading. #568

Job	Run time
call-workflow / Python 3.14 on ubuntu-22.04	3m 37s
call-workflow / Python 3.13 on macos-14	2m 1s
call-workflow / Python 3.13 on ubuntu-22.04	5m 56s
call-workflow / Python 3.14 on macos-14	2m 54s
call-workflow / Python 3.12 on ubuntu-22.04	10m 36s
call-workflow / Python 3.11 on ubuntu-22.04	10m 53s
call-workflow / Python 3.13 on ubuntu-22.04-arm	8m 7s
call-workflow / Python 3.11 on macos-14	5m 55s
call-workflow / Python 3.12 on ubuntu-22.04-arm	3m 24s
call-workflow / Python 3.14 on ubuntu-22.04-arm	9m 59s
call-workflow / Python 3.11 on ubuntu-22.04-arm	9m 0s
call-workflow / Python 3.12 on macos-14	2m 59s
call-workflow / publish-wheel	0s
	1h 15m 21s

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