Block device abstraction for OCaml 5 with Eio direct-style I/O and Bytesrw integration

fix(E320): shorten test_parse_xattr_truncated_value_size identifier

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fuzz/fuzz_block.mli
··· 1 + (** Fuzz tests for {\!Block}. *) 2 + 1 3 val suite : string * Crowbar.test_case list 4 + (** Test suite. *)