WIP: Permit unused_imports (DF 42.2.0 branch)

Author: srh

Cargo.toml

@@ -167,7 +167,7 @@ large_futures = "warn"
 
 [workspace.lints.rust]
 unexpected_cfgs = { level = "warn", check-cfg = ["cfg(tarpaulin)"] }
-unused_imports = "deny"
+# unused_imports = "deny"
 
 [patch.'https://github.com/cube-js/arrow-rs.git']
 arrow = { path = "../arrow-rs/arrow" }