feat(network2): add Leios mini-protocols (LeiosNotify, LeiosFetch) #57

Job	Run time
Rustfmt	6s
Features (--all-features)	1m 3s
Docs	49s
Clippy	56s
MSRV (1.88)	55s
Test (ubuntu-latest)	1m 19s
Features (--no-default-features)	1m 8s
Test (macos-latest)	1m 19s
Test (windows-latest)	3m 3s
Isolated no-default-features	30s
	11m 8s

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