Move Blob's `read` to an impl of std::io::Read.
Move Blob's `read` to an impl of std::io::Read.

gwenn/rusqlite,xinghun92/rusqlite,jgallagher/rusqlite,jgallagher/rusqlite,xinghun92/rusqlite,xinghun92/rusqlite,mikelodder7/rusqlcipher,mikelodder7/rusqlcipher,mikelodder7/rusqlcipher,jgallagher/rusqlite,gwenn/rusqlite,gwenn/rusqlite