refactor: Remove batch concept from opendal #2130

Job	Run time
build_all_features	4m 44s
build_default_features (ubuntu-latest)	33s
build_all_platforms (ubuntu-latest)	2m 27s
build_default_features (macos-latest)	36s
build_all_platforms (macos-latest)	3m 27s
build_default_features (windows-latest)	2m 27s
build_under_wasm	55s
build_all_platforms (windows-latest)	4m 50s
check_clippy	3m 44s
check_docs	3m 40s
unit	7m 16s
check_msrv	30s
	35m 9s

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