BREAKING(http/unstable): switch `params` and `info` args in `Handler` in `route()` for more conveniency

[lowlighter]

Closes #5884

Not sure if it qualifies for "breaking change" since the API is still unstable, but it does break apps relying on current implementation route()

As explained in the linked issue, since params: URLPatternResult is way more likely to be used than info: Deno.ServeHandlerInfo in non-default handlers, it makes sense to switch them for improved DX