feat: native tokens #203

Job	Run time
check no-default-features	35s
check serde	30s
check std	54s
Test Native Tokens	50s
test stable --no-default-features	1m 27s
test no_std	40s
test stable	1m 48s
test stable --all-features	2m 30s
clippy	2m 40s
test beta --no-default-features	1m 37s
test beta	1m 27s
test beta --all-features	2m 32s
docs	2m 1s
fmt	8s
test nightly --no-default-features	1m 19s
test nightly	1m 24s
test nightly --all-features	2m 28s
	24m 50s

Provide feedback