refactor(iroh-net): Optimise present nodes in ActiveRelay #2781
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Description
The ActiveRelay actor keeps track of which remote nodes are present on the relay connection so that we can optimise relay connections to remote nodes. This does two main optimisations:
There were two sets of these nodes kept, they could easily be unified.
The set is best stored in a BTreeSet since they are simple NodeIds stored in them.
Bonus: rename peer to node to match our naming convention.
Bonus: identify nodes by NodeId since this is a routing key here.
Breaking Changes
Still none if all is well.
Notes & open questions
This targets #2779 as base.
Change checklist
[ ] Tests if relevant.[ ] All breaking changes documented.