feat(engine): Add JSON Web Token (JWT) token generation and validation support #2012

Job	Run time
test stable --no-default-features	1m 23s
test stable	1m 8s
clippy	26s
test stable --all-features	2m 12s
doctest	56s
test nightly --no-default-features	1m 14s
feature-checks	2m 15s
test nightly	1m 13s
no-std	14s
test nightly --all-features	2m 0s
test 1.76 --no-default-features	41s
wasm-unknown	29s
wasm-wasi	1m 9s
test 1.76	35s
cfg-check	26s
docs	54s
fmt	13s
	17m 28s

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