Make TypeScript peer dependency optional

Thanks for this library!

I'm noticing that because TypeScript is a [peer dependency](https://github.com/google/react-schemaorg/blob/dac2d83725b210c13a0dff54e9b2271765141837/package.json#L31) that when this library is used as dependency in a package that bundles to JavaScript, when that package is installed, TypeScript is also installed, even when the project does not use TypeScript.

I'm guessing the idea is to try to ensure compatibility with the types, but it's ~40MB to install TypeScript that might be avoided by making this peer dependency optional.

Abre package.json en la entrada de dependencia peer de TypeScript enlazada en el issue. Comprueba cómo está declarada la dependencia y actualízala para que los consumidores que no usan TypeScript no estén obligados a instalarla. Verifica los metadatos del paquete y el comportamiento de instalación para un consumidor que solo use JavaScript.

Escrito por el modelo de indexación a partir del texto del issue.