feat: `OpTransactionRequest` #762

Job	Run time
wasm-unknown	38s
cfg-check	18s
docs	27s
clippy	27s
doctest	36s
feature-checks	1m 19s
feature-powerset	25m 2s
fmt	13s
no-std	31s
wasm-wasi	38s
test stable --no-default-features	48s
test stable	53s
test stable --all-features	1m 26s
test nightly --no-default-features	41s
test nightly	45s
test nightly --all-features	1m 16s
test 1.81 --no-default-features	42s
test 1.81	29s
	37m 9s

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