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[io_engine] Remove duplicate code in tests
[build] Update roaring to 0.11.0
[io_engine] Implement AsyncIoEngine::read_blocks() for streaming read
[all] Apply cargo fmt, and fix clippy lints
[io_engine] Add BufferPool
[io_engine] Add documentation to io_engine/gaps.rs
[io_engine] Shortcut the io::ErrorKind::Other creation
[io_engine] Introduce io_engine/ring_pool.rs
[io_engine] Improve partial read handling in VectoredBlockIo