Add Backed Enum Support to Inertia::render()

[onairmarc]

This PR adds backed enum support to Inertia::render() through the ResponseFactory class.

The render method now first checks if the $component parameter is an instance of BackedEnum. If $component is not a BackedEnum, the method continues as normal. If $component is a BackedEnum, it then checks to ensure that the backing value is a string. If the backing value is a string, the method continues as normal. If the backing value is not a string, the method throws an InvalidArgumentException with a message stating the accepted argument types.

[onairmarc]

@joetannenbaum can this PR please get some love? 🤓

[pascalbaljet]

I like it, but it's a breaking change for people who are extending ResponseFactory and overriding the render() method. I think the only safe way is to remove the type hint altogether and rely on a docblock.

[onairmarc]

@pascalbaljet I just removed the type hint in favor to the docblock