feat: clean up `p2p` & implement missing peering functionality #6374

Job	Run time
setup	3s
Run Main (gnodev) / Go Build / generated	9s
Run Main (gnodev) / Go Linter / lint	49s
Run Main (gnodev) / Go Test / test	1m 15s
Run Main (gnofaucet) / Go Linter / lint	28s
Run Main (gnofaucet) / Go Build / generated	11s
Run Main (gnofaucet) / Go Test / test	39s
Run Main (gnogenesis) / Go Build / generated	6s
Run Main (gnogenesis) / Go Linter / lint	44s
Run Main (gnogenesis) / Go Test / test	49s
Run Main (gnokeykc) / Go Build / generated	11s
Run Main (gnokeykc) / Go Linter / lint	33s
Run Main (gnokeykc) / Go Test / test	46s
Run Main (gnomd) / Go Linter / lint	26s
Run Main (gnomd) / Go Build / generated	11s
Run Main (gnomd) / Go Test / test	30s
Run Main (gnomigrate) / Go Build / generated	9s
Run Main (gnomigrate) / Go Linter / lint	33s
Run Main (gnomigrate) / Go Test / test	40s
	9m 12s

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