fix(swarm): rewrite `NetworkBehaviour` macro for more optimal code gen

[jakubDoka]

Description

I have rewritten NetworkBehavior derive macro to generate more optimal and faster to compile code when using more behaviours (5, 10, 20), I noticed performance degrades even though I benchmarked the same load. This is related to https://github.com/libp2p/rust-libp2p/pull/5026.

New macro implementation generates enums and structs for each type implementing the traits instead of type-level linked lists. In many cases, this makes resulting types more compact (we store just one enum tag, whereas composed Eithers each need to store tags to make values addressable) and makes the enum dispatch constant. This also opened the opportunity to optimize UpgradeInfoIterator and ConnectionHandler into a state machine (they now remember where they stopped polling/iterating and skipped exhausted subhandlers/iterators). We could optimize the NetworkBehaviour itself too, but it would require users to put extra fields into the struct (this could be optional for BC).

Change checklist

• [x] I have performed a self-review of my code
• [x] I have made corresponding changes to the documentation (none)
• [x] I have added tests that prove my fix is effective or that my feature works (no regressions)
• [x] A changelog entry has been made in the appropriate crates

note: I misused the sync feature on github and it erased all my changes from the branch, thus pr #5303 was closed @jxs, @thomaseizinger.