feat(p2p): add external address configuration for NAT/Docker #249

Job	Run time
Build	1m 52s
Clippy	1m 30s
Test	1m 13s
Coverage	1m 24s
Nightly Build & Test	0s
Docker Nightly Build	0s
Integration	1s
Docker Integration (5 Validators + WASM)	1s
Docker	1s
E2E	1s
Release	1s
	6m 4s

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