[11.x] Replace all backed enums with values when building URLs

[stefanvdlugt]

When building a URL, the UrlGenerator takes each parameter that is a backed enum instance, and replaces it with its underlying value. This PR lets the UrlGenerator also replace backed enums that are nested more deeply in the $parameters array. This is useful when passing an array of enums as one of the parameters, for example when adding a filter query parameter.

Example:

route('foo', ['filters' => [MyEnum::One, MyEnum::Two]])
= http://example.com/foo?filters%5B0%5D=one&filters%5B1%5D=two

Previous behavior:

You'd get this URL from the above command, which includes the name and value of each enum instance separately:

= http://example.com/foo?filters%5B0%5D%5Bname%5D=One&filters%5B0%5D%5Bvalue%5D=one&filters%5B1%5D%5Bname%5D=Two&filters%5B1%5D%5Bvalue%5D=two

In order to get the shorter URL you'd have to add ->value to each enum instance.

Breaking changes

None as far as I can tell, unless you were using arrays of enum instances as parameter values as in the above example. I don't assume anyone did, looking at the format of the above URL, but maybe I'm missing something.

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