Previously we'd return the Url string. Now we provide a Url
object that provides access to the various elements of the Url.
This will cause slightly breakage for folks that were treating
it as a string in their status event handlers, for example.
The docs have been updated to show how to run with both this
new Url object and also continue to run on older versions of
wezterm.
They now also show how to manually percent decode the url
for older versions of wezterm.
refs: https://github.com/wez/wezterm/discussions/4157
refs: https://github.com/wez/wezterm/issues/4000
