refactor: Restructure project layout and clean up dependencies (#30)

This commit introduces a significant reorganization of the project structure to improve maintainability and clarity.

Key changes include:
- Adjusted the directory layout for a more logical module organization.
- Removed unused crate dependencies, reducing the overall project size and potentially speeding up build times.
- Updated import paths and configuration files to reflect the structural changes.

crates/s3select-query/src/execution/factory.rs

@@ -0,0 +1,60 @@
+// Copyright 2024 RustFS Team
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use std::sync::Arc;
+
+use async_trait::async_trait;
+use rustfs_s3select_api::{
+    QueryError,
+    query::{
+        execution::{QueryExecutionFactory, QueryExecutionRef, QueryStateMachineRef},
+        logical_planner::Plan,
+        optimizer::Optimizer,
+        scheduler::SchedulerRef,
+    },
+};
+
+use super::query::SqlQueryExecution;
+
+pub type QueryExecutionFactoryRef = Arc<dyn QueryExecutionFactory + Send + Sync>;
+
+pub struct SqlQueryExecutionFactory {
+    optimizer: Arc<dyn Optimizer + Send + Sync>,
+    scheduler: SchedulerRef,
+}
+
+impl SqlQueryExecutionFactory {
+    #[inline(always)]
+    pub fn new(optimizer: Arc<dyn Optimizer + Send + Sync>, scheduler: SchedulerRef) -> Self {
+        Self { optimizer, scheduler }
+    }
+}
+
+#[async_trait]
+impl QueryExecutionFactory for SqlQueryExecutionFactory {
+    async fn create_query_execution(
+        &self,
+        plan: Plan,
+        state_machine: QueryStateMachineRef,
+    ) -> Result<QueryExecutionRef, QueryError> {
+        match plan {
+            Plan::Query(query_plan) => Ok(Arc::new(SqlQueryExecution::new(
+                state_machine,
+                query_plan,
+                self.optimizer.clone(),
+                self.scheduler.clone(),
+            ))),
+        }
+    }
+}