Add URI#with

[jrieken]

Similar to how we can check Ranges and Postions for equality we should be able to check URIs for equality. It would serve as a short hand for the popular uri.toString() === anotherUri.toString() which you find often. Question is if some path normalisation should be applied on top?

[jrieken]

and also the with methods we have on the underlying type such that uri can be modified nicely. This might prevent some issues when path/uri-math happens