Revert "feat: add objectIdEqualityTester helper"

This reverts commit 95794ad.

README.md

@@ -129,17 +129,3 @@ test("my test", async ({ db, mongoClient }) => {
   expect(await users.countDocuments()).toBe(1);
 });
 ```
-
-### Checking object id equality
-
-If you encounter the error "Compared values have no visual difference." when comparing object ids, you'll likely need to add a [custom equality tester](https://vitest.dev/api/expect.html#expect-addequalitytesters) to vitest. This module exports a setup file for this purpose:
-
-```js
-import { defineConfig } from "vitest/config";
-
-export default defineConfig({
-  test: {
-    setupFiles: ["vitest-mms/objectIdEqualityTester"],
-  },
-});
-```

package.json

@@ -4,11 +4,6 @@
   "version": "0.1.6",
   "description": "mongodb-memory-server integration for vitest",
   "exports": {
-    "./objectIdEqualityTester": {
-      "types": "./dist/objectIdEqualityTester.d.ts",
-      "require": "./dist/objectIdEqualityTester.cjs",
-      "import": "./dist/objectIdEqualityTester.mjs"
-    },
     "./setupFile": {
       "types": "./dist/setupFile.d.ts",
       "require": "./dist/setupFile.cjs",