feat: implement Symbol.dispose for Statement to support using state…

…ments

doc.md

@@ -146,6 +146,15 @@ retrieve the results, and more.
 
 ```ts
 const stmt = db.prepare("SELECT * FROM foo WHERE bar = ? AND baz = ?");
+
+// or with a using statement
+
+{
+  using stmt = db.prepare("SELECT * FROM foo WHERE bar = ? AND baz = ?");
+  // use stmt
+}
+
+// automatically disposed
 ```
 
 For more details on binding parameters, see
@@ -251,6 +260,18 @@ this method.
 stmt.finalize();
 ```
 
+You can also use `using` statement to automatically free the statement once the
+scope ends.
+
+```ts
+{
+  using stmt = db.prepare("SELECT * FROM foo WHERE bar = ? AND baz = ?");
+  stmt.run("bar", "baz");
+}
+
+// stmt is automatically finalized here
+```
+
 ## Setting fixed parameters
 
 To set fixed parameters for a statement, use the `bind()` method. This method

src/statement.ts

@@ -785,4 +785,12 @@ export class Statement {
     }
     sqlite3_reset(this.#handle);
   }
+
+  [Symbol.dispose](): void {
+    this.finalize();
+  }
+
+  [Symbol.for("Deno.customInspect")](): string {
+    return `Statement { ${this.expandedSql} }`;
+  }
 }