feat: `OpTransactionRequest` (#215) #763

Job	Run time
doctest	52s
no-std	30s
test stable --no-default-features	1m 5s
test stable	1m 7s
wasm-unknown	51s
wasm-wasi	48s
test stable --all-features	1m 23s
cfg-check	31s
test nightly --no-default-features	39s
test nightly	51s
clippy	35s
test nightly --all-features	1m 5s
test 1.81 --no-default-features	1m 4s
test 1.81	57s
docs	34s
feature-checks	1m 39s
fmt	11s
feature-powerset	24m 51s
	39m 33s

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