build: add jest, tests

tests/removeObjectProperty.test.ts

@@ -0,0 +1,9 @@
+import { expect, test } from "@jest/globals";
+import { removeObjectProperty } from "../src";
+
+test("remove object property by provided key", () => {
+  expect(removeObjectProperty({ a: "1", b: "2", c: "3" }, "c")).toMatchObject({
+    a: "1",
+    b: "2",
+  });
+});