feat: add core-net feature (#30) #98

Job	Run time
clippy	14s
feature checks	16s
docs	15s
fmt	12s
test stable --no-default-features	13s
test stable	10s
check WASM	14s
test stable --all-features	12s
test beta --no-default-features	17s
test beta	21s
test beta --all-features	19s
test nightly --no-default-features	18s
test nightly	14s
test nightly --all-features	15s
test 1.64 --no-default-features	59s
test 1.64	53s
test 1.64 --all-features	55s
	6m 17s

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