luci-base: introduce luci.dispatcher.lookup()

The lookup function takes multiple, possibly malformed path fragments,
splits them on slashes, constructs a temporary path and looks up the
result in the dispatch tree.

If a matching node has been found, the function will return both the
node reference and the canonical url to it.

If no corresponding node is found, the function returns nil.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

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