Introduce automatic Kademlia mode for subspace-networking. #2411

Job	Run time
cargo-docs	6m 22s
cargo-clippy (self-hosted, ubuntu-20.04-x86-64)	8m 8s
cargo-clippy (self-hosted, macos-12-arm64)	8m 19s
cargo-test (self-hosted, ubuntu-20.04-x86-64)	16m 35s
cargo-fmt	2m 16s
cargo-clippy (self-hosted, windows-server-2022-x86-64)	13m 48s
cargo-test (self-hosted, macos-12-arm64)	21m 54s
cargo-test (self-hosted, windows-server-2022-x86-64)	19m 14s
	1h 36m 36s

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