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/mod.rs

@@ -0,0 +1,57 @@
+// 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 s3s::dto::SelectObjectContentInput;
+
+pub mod analyzer;
+pub mod ast;
+pub mod datasource;
+pub mod dispatcher;
+pub mod execution;
+pub mod function;
+pub mod logical_planner;
+pub mod optimizer;
+pub mod parser;
+pub mod physical_planner;
+pub mod scheduler;
+pub mod session;
+
+#[derive(Clone)]
+pub struct Context {
+    // maybe we need transfer some info?
+    pub input: Arc<SelectObjectContentInput>,
+}
+
+#[derive(Clone)]
+pub struct Query {
+    context: Context,
+    content: String,
+}
+
+impl Query {
+    #[inline(always)]
+    pub fn new(context: Context, content: String) -> Self {
+        Self { context, content }
+    }
+
+    pub fn context(&self) -> &Context {
+        &self.context
+    }
+
+    pub fn content(&self) -> &str {
+        self.content.as_str()
+    }
+}