feat(consensus): add is_deposit to OpTxEnvelope #1310

Job	Run time
docs	52s
cfg-check	50s
clippy	39s
doctest	38s
feature-checks	1m 45s
feature-powerset	2m 22s
examples	11s
fmt	10s
no-std	44s
test stable --no-default-features	44s
wasm-unknown	55s
wasm-wasi	38s
test stable	45s
test stable --all-features	49s
test nightly --no-default-features	1m 3s
test nightly	1m 5s
test nightly --all-features	1m 3s
test 1.81 --no-default-features	48s
test 1.81	52s
	16m 53s

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