Add hook for redirect function in ServeHTTP #940
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To migrate direct callers, a flipr controlled gate is needed. This PR adds a hook in Zanzibar Router's ServeHTTP function so that a redirect function can be plugged in, to redirect the requests (received for a particular endpoint) a different gateway.
This cannot be done at middleware level as ServeHTTP function also emits endpoint metrics which should not be emitted if the requests are being served by another gateway.