feat: clean up `p2p` & implement missing peering functionality #4766

Job	Run time
setup	4s
Run Main (gnodev) / Go Build / generated	8s
Run Main (gnofaucet) / Go Build / generated	10s
Run Main (gnofaucet) / Go Linter / lint	36s
Run Main (gnofaucet) / Go Test / test	42s
Run Main (gnodev) / Go Linter / lint	47s
Run Main (gnokeykc) / Go Linter / lint	35s
Run Main (gnodev) / Go Test / test	50s
Run Main (gnokeykc) / Go Build / generated	10s
Run Main (gnokeykc) / Go Test / test	44s
Run Main (gnomd) / Go Linter / lint	22s
Run Main (gnomd) / Go Build / generated	10s
Run Main (gnomd) / Go Test / test	25s
	5m 43s

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