Add conversion `TxKind` -> `Option<Address>` #2040

Job	Run time
clippy	1m 12s
check no_std	43s
docs	55s
fmt	14s
miri --no-default-features	5m 4s
features stable	2m 10s
miri	5m 9s
test ubuntu-latest stable --no-default-features	1m 11s
wasm	38s
features stable --all-targets	3m 14s
miri --all-features	6m 58s
test ubuntu-latest stable	1m 18s
features nightly	2m 27s
test ubuntu-latest nightly --no-default-features	1m 19s
features nightly --all-targets	3m 30s
test ubuntu-latest nightly	1m 17s
test ubuntu-latest 1.79 --no-default-features	38s
test ubuntu-latest 1.79	38s
test windows-latest stable --no-default-features	3m 8s
test windows-latest stable	3m 3s
test windows-latest nightly --no-default-features	3m 0s
test windows-latest nightly	2m 53s
test windows-latest 1.79 --no-default-features	1m 20s
test windows-latest 1.79	1m 36s
test ubuntu-latest 1.79 --features json	35s
test windows-latest 1.79 --features json	1m 27s
test ubuntu-latest nightly --all-features	1m 26s
test windows-latest nightly --all-features	2m 52s
	59m 55s

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