fix bench command line options (#1685)

fix to criterion bench not accepts options

```
error: Unrecognized option: 'save-baseline'
error: bench failed
```
bheisler/criterion.rs#193 (comment)

Author: kazuk

arrow/Cargo.toml

@@ -35,6 +35,7 @@ rust-version = "1.57"
 [lib]
 name = "arrow"
 path = "src/lib.rs"
+bench = false
 
 [dependencies]
 serde = { version = "1.0" }

parquet/Cargo.toml

@@ -90,3 +90,6 @@ harness = false
 name = "arrow_reader"
 required-features = ["test_common", "experimental"]
 harness = false
+
+[lib]
+bench = false