speed up Log::agent_by_addr

We know that the way we construct the Log, the agents are always sorted
by their address. This invariant cannot be broken, as the only way to
construct a Log is in evtclib itself, and there is no way to obtain a
mutable view on the agent vector or change the address of an agent.

Since Log::agent_by_addr is used by other functions, this speedup (even
if it is small) can show in a lot of different places.

Note that if we change the interface of Log in the future to allow
creating logs from different sources that processing::process, we need
to make sure we adjust this function.

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