Add conversion `TxKind` -> `Option<Address>` (#750) #2041

Job	Run time
docs	55s
check no_std	42s
clippy	1m 9s
fmt	13s
features stable	2m 11s
features stable --all-targets	3m 41s
miri --no-default-features	5m 8s
features nightly	2m 25s
test ubuntu-latest stable --no-default-features	1m 16s
miri	5m 7s
wasm	35s
features nightly --all-targets	3m 26s
test ubuntu-latest stable	1m 28s
miri --all-features	6m 52s
test ubuntu-latest nightly --no-default-features	1m 20s
test ubuntu-latest nightly	1m 13s
test ubuntu-latest 1.79 --no-default-features	38s
test ubuntu-latest 1.79	41s
test windows-latest stable --no-default-features	2m 34s
test windows-latest stable	3m 31s
test windows-latest nightly --no-default-features	2m 54s
test windows-latest nightly	2m 56s
test windows-latest 1.79 --no-default-features	1m 22s
test windows-latest 1.79	1m 11s
test ubuntu-latest 1.79 --features json	35s
test windows-latest 1.79 --features json	1m 23s
test ubuntu-latest nightly --all-features	1m 26s
test windows-latest nightly --all-features	3m 10s
	1h 0m 2s

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