Document whether `Uri::path` and friends return (un-)escaped strings or not

[nagisa]

[sagebind]

This caught me off-guard as well; I assumed that accessing the URI components would do the percent decoding for me but it seems that is not the case. Perhaps we could add accessors for the decoded form through an optional dependency such as percent-encoding?

[Nugine]

Hi! Is there any progress on this issue?