feat: add OpPooledTransaction (#341) #1166

Job	Run time
doctest	56s
test stable --no-default-features	1m 12s
test stable	1m 14s
no-std	44s
test stable --all-features	1m 31s
test nightly --no-default-features	1m 27s
wasm-unknown	1m 20s
test nightly	1m 48s
test nightly --all-features	1m 44s
test 1.81 --no-default-features	46s
wasm-wasi	1m 5s
test 1.81	50s
clippy	58s
docs	1m 8s
feature-checks	3m 29s
cfg-check	53s
examples	1m 2s
feature-powerset	4m 45s
fmt	15s
	27m 7s

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