unused import warning when building without the sql feature

[corasaurus-hex]

Describe the bug

I was running commands from CI locally to ensure another PR was solid and I came across this warning:

❯ cargo check --profile ci --no-default-features -p datafusion
    Checking datafusion v50.3.0 (/Users/cora/Code/datafusion/datafusion/core)
warning: unused import: `Dialect`
  --> datafusion/core/src/execution/session_state.rs:40:65
   |
40 | use datafusion_common::config::{ConfigExtension, ConfigOptions, Dialect, TableOptions};
   |                                                                 ^^^^^^^
   |
   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default

warning: `datafusion` (lib) generated 1 warning (run `cargo fix --lib -p datafusion` to apply 1 suggestion)
    Finished `ci` profile [unoptimized] target(s) in 3.22s

To Reproduce

cargo check --profile ci --no-default-features -p datafusion

Expected behavior

No warnings

Additional context

Low priority, just a warning I noticed. I'll put up a PR momentarily.