judge: add getFile()

packages/hydrojudge/src/sandbox.ts

@@ -179,6 +179,10 @@ export async function del(fileId: string) {
     await client.deleteFile(fileId);
 }
 
+export async function get(fileId: string) {
+    return await client.getFile(fileId);
+}
+
 export async function run(execute: string, params?: Parameter): Promise<SandboxAdaptedResult> {
     let result: SandboxResult;
     try {