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Part of #8130. ## Problem Currently, decompression is performed within the `read_blobs` implementation and the decompressed blob will be appended to the end of the `BytesMut` buffer. We will lose this flexibility of extending the buffer when we switch to using our own dio-aligned buffer (WIP in https://github.com/neondatabase/neon/pull/8730). To facilitate the adoption of aligned buffer, we need to refactor the code to perform decompression outside `read_blobs`. ## Summary of changes - `VectoredBlobReader::read_blobs` will return `VectoredBlob` without performing decompression and appending decompressed blob. It becomes the caller's responsibility to decompress the buffer. - Added a new `BufView` type that functions as `Cow<Bytes, &[u8]>`. - Perform decompression within `VectoredBlob::read` so that people don't have to explicitly thinking about compression when using the reader interface. Signed-off-by: Yuchen Liang <yuchen@neon.tech>