Define trait `TransactionEnvelope` #5741

Job	Run time
docs	1m 0s
clippy	1m 29s
doctest	3m 2s
check no_std	56s
feature-checks	8m 25s
fmt	11s
wasm-unknown	2m 59s
test ubuntu-latest stable --no-default-features	1m 53s
wasm-wasi	4m 3s
test ubuntu-latest stable	1m 56s
test ubuntu-latest stable --all-features	2m 5s
test ubuntu-latest nightly --no-default-features	1m 8s
test ubuntu-latest nightly	1m 6s
test ubuntu-latest nightly --all-features	1m 18s
test ubuntu-latest 1.81 --no-default-features	1m 53s
test ubuntu-latest 1.81	1m 36s
test windows-latest stable --no-default-features	4m 11s
test windows-latest stable	4m 8s
test windows-latest stable --all-features	4m 22s
test windows-latest nightly --no-default-features	4m 39s
test windows-latest nightly	4m 22s
test windows-latest nightly --all-features	3m 56s
test windows-latest 1.81 --no-default-features	5m 7s
test windows-latest 1.81	3m 23s
deny / cargo deny check	24s
ci success	4s
	1h 9m 36s

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