feat: native tokens #213

Job	Run time
check serde	41s
check no-default-features	44s
check std	49s
clippy	2m 51s
fmt	18s
docs	2m 16s
test stable --no-default-features	1m 42s
Test Native Tokens	43s
test stable	1m 58s
test no_std	1m 21s
test stable --all-features	2m 46s
test beta --no-default-features	1m 34s
test beta	1m 27s
test beta --all-features	2m 37s
test nightly --no-default-features	3m 54s
test nightly	3m 43s
test nightly --all-features	4m 9s
	33m 33s

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