Concurrent data file fetching and parallel RecordBatch processing #1393

Job	Run time
build (ubuntu-latest)	4m 12s
build_with_no_default_features (ubuntu-latest)	1m 21s
build (macos-latest)	10m 40s
build_with_no_default_features (macos-latest)	1m 24s
build (windows-latest)	10m 35s
check (ubuntu-latest)	5m 11s
build_with_no_default_features (windows-latest)	5m 26s
check (macos-latest)	17m 15s
unit	8m 35s
	1h 4m 39s

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