refactor: Remove batch concept from opendal #2128

Job	Run time
build_all_features	4m 54s
build_all_platforms (ubuntu-latest)	2m 44s
build_all_platforms (macos-latest)	2m 27s
build_default_features (ubuntu-latest)	39s
build_all_platforms (windows-latest)	6m 2s
build_default_features (macos-latest)	39s
build_default_features (windows-latest)	2m 3s
build_under_wasm	47s
check_clippy	3m 57s
check_docs	3m 27s
check_msrv	32s
unit	6m 5s
	34m 16s

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