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The global per-peer dial timeout had a significant drawback: When dialing many
peers, this timeout could cause libp2p to cancel dials while they were still
stuck in the limiter.

A better but more complicated approach is a time budget system but we can
implement that later.

This change simply applies the limit to each `DialPeer`/`NewStream` call
independently and makes it easy to override. While old timeout tried to
account for how much we're willing to spend dialing a single peer, this new
timeout tries to account for the amount of time a single "client" is willing to
wait for a dial to complete before they no longer care.