Debug log inspection performance penalty

It seems that even when the log level is set to :warn or :info the inspections made in debug logs are still executed despite not being used, this is because a straight string is passed to the Logger instead of anonymous functions (at least in the tracker).

See: https://elixirforum.com/t/use-of-inspect-in-log-messages/2100/7

A significant amount of reductions were seen in our app and many calls to `printable?` from within `Swarm.Tracker` we suspect this is the cause as large structures are inspected as part of the debug messages.

Ideally anonymous functions should be passed to Logger in all instances so disabled log levels don't incur a penalty when inspecting structures for printing.

Start by reviewing debug logging and inspection calls in Swarm.Tracker, then check for similar Logger calls elsewhere in the project. The work is done when disabled debug levels no longer evaluate large structures for logging and the relevant behavior is covered by the project's tests.

Written by the indexing model from the issue text.