Define trait `TransactionEnvelope` #5739

Job	Run time
docs	2m 10s
check no_std	56s
doctest	2m 52s
feature-checks	8m 35s
clippy	1m 34s
fmt	13s
test ubuntu-latest stable --no-default-features	1m 58s
wasm-wasi	3m 52s
wasm-unknown	2m 57s
test ubuntu-latest stable	2m 1s
test ubuntu-latest stable --all-features	2m 6s
test ubuntu-latest nightly --no-default-features	2m 7s
test ubuntu-latest nightly	2m 19s
test ubuntu-latest nightly --all-features	2m 22s
test ubuntu-latest 1.81 --no-default-features	1m 38s
test ubuntu-latest 1.81	1m 42s
test windows-latest stable --no-default-features	3m 59s
test windows-latest stable	4m 6s
test windows-latest stable --all-features	6m 6s
test windows-latest nightly --no-default-features	5m 44s
test windows-latest nightly	5m 42s
test windows-latest nightly --all-features	6m 28s
test windows-latest 1.81 --no-default-features	5m 33s
test windows-latest 1.81	3m 24s
deny / cargo deny check	23s
ci success	3s
	1h 20m 50s

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