[frame/im-online] remove network state from heartbeats (#7309)

* [frame/im-online] remove external_addresses from heartbeat

* new benchmarks

* format code

* Revert "format code"

This reverts commit 586ddaa6f588b4aef92a0169cfd6a9610d1337b8.

* remove MaxPeerDataEncodingSize

* update lockfile for {"substrate"}

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Co-authored-by: parity-processbot <>