Move Jest config to TypeScript file

Reasons:

1. This is officially recommended
   <https://jestjs.io/docs/configuration>
2. Reduces clutter in package.json
3. Allows type checking and IDE hints for config options.

ts-node is required to read the TypeScript configuration file.

jest.config.ts

@@ -0,0 +1,9 @@
+import type { Config } from 'jest';
+
+const config: Config = {
+  transformIgnorePatterns: [
+    "jest-runner",
+  ],
+};
+
+export default config;