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-api/src/query/dispatcher.rs

@@ -0,0 +1,46 @@
+// 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 crate::QueryResult;
+
+use super::{
+    Query,
+    execution::{Output, QueryStateMachine},
+    logical_planner::Plan,
+};
+
+#[async_trait]
+pub trait QueryDispatcher: Send + Sync {
+    // fn create_query_id(&self) -> QueryId;
+
+    // fn query_info(&self, id: &QueryId);
+
+    async fn execute_query(&self, query: &Query) -> QueryResult<Output>;
+
+    async fn build_logical_plan(&self, query_state_machine: Arc<QueryStateMachine>) -> QueryResult<Option<Plan>>;
+
+    async fn execute_logical_plan(&self, logical_plan: Plan, query_state_machine: Arc<QueryStateMachine>) -> QueryResult<Output>;
+
+    async fn build_query_state_machine(&self, query: Query) -> QueryResult<Arc<QueryStateMachine>>;
+
+    // fn running_query_infos(&self) -> Vec<QueryInfo>;
+
+    // fn running_query_status(&self) -> Vec<QueryStatus>;
+
+    // fn cancel_query(&self, id: &QueryId);
+}