fix: eliminate warning when building without sql feature (#18480)

## Which issue does this PR close?

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- Closes #18479.

You can see an example run with the warning
[here](https://github.com/apache/datafusion/actions/runs/19056329292/job/54427495514),
just expand the `Check datafusion (no-default-features)` section.

## Rationale for this change

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Fixes a warning when building without the sql feature.

## What changes are included in this PR?

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Makes a `use` declaration conditional based on the sql feature.

## Are these changes tested?

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I ran the same command and had no issues.

## Are there any user-facing changes?

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Nope!

Author: corasaurus-hex

datafusion/core/src/execution/session_state.rs

@@ -37,7 +37,9 @@ use datafusion_catalog::information_schema::{
 use datafusion_catalog::MemoryCatalogProviderList;
 use datafusion_catalog::{TableFunction, TableFunctionImpl};
 use datafusion_common::alias::AliasGenerator;
-use datafusion_common::config::{ConfigExtension, ConfigOptions, Dialect, TableOptions};
+#[cfg(feature = "sql")]
+use datafusion_common::config::Dialect;
+use datafusion_common::config::{ConfigExtension, ConfigOptions, TableOptions};
 use datafusion_common::display::{PlanType, StringifiedPlan, ToStringifiedPlan};
 use datafusion_common::tree_node::TreeNode;
 use datafusion_common::{