chore: add OtsReceipt type #1603

Job	Run time
test stable --no-default-features	1m 34s
doctest	1m 17s
test stable	1m 31s
feature-checks	2m 40s
test stable --all-features	1m 59s
no-std	18s
wasm-unknown	1m 48s
test nightly --no-default-features	1m 30s
test nightly	1m 21s
wasm-wasi	2m 37s
test nightly --all-features	1m 47s
cfg-check	30s
test 1.76 --no-default-features	40s
clippy	37s
test 1.76	49s
docs	56s
fmt	13s
	22m 7s

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