refactor: clean perf related

- use array instead of vec when it's useless
clippy lint message: useless use of `vec!` help: you can use an array directly.
help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.92.0/index.html#useless_vec
- call as_bytes before slicing
lint message: calling `as_bytes` after slicing a string
help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.92.0/index.html#sliced_string_as_bytes

Signed-off-by: Gwen Lg <me@gwenlg.fr>

src/block/manager.rs

@@ -173,7 +173,7 @@ impl BlockManager {
 			data_fsync: config.data_fsync,
 			disable_scrub: config.disable_scrub,
 			compression_level: config.compression_level,
-			mutation_lock: vec![(); MUTEX_COUNT]
+			mutation_lock: [(); MUTEX_COUNT]
 				.iter()
 				.map(|_| Mutex::new(BlockManagerLocked()))
 				.collect::<Vec<_>>(),