feat(primitives): Add Borsh support for `TxKind` #2743

Job	Run time
check no_std	53s
wasm	43s
miri --no-default-features	6m 2s
miri	6m 53s
miri --all-features	9m 13s
features stable	2m 39s
features nightly --all-targets	4m 18s
features nightly	2m 58s
clippy	1m 18s
features stable --all-targets	3m 54s
docs	1m 15s
test ubuntu-latest nightly --no-default-features	1m 13s
test ubuntu-latest nightly	1m 17s
test windows-latest stable --no-default-features	3m 1s
test ubuntu-latest stable	1m 16s
test ubuntu-latest 1.85 --no-default-features	39s
test windows-latest 1.85 --no-default-features	3m 3s
test windows-latest 1.85	1m 53s
test windows-latest nightly	3m 24s
test windows-latest nightly --no-default-features	3m 52s
test windows-latest 1.85 --features json	2m 9s
typos	7s
test ubuntu-latest nightly --all-features	1m 40s
test ubuntu-latest 1.85 --features json	40s
fmt	13s
test ubuntu-latest stable --no-default-features	1m 17s
test windows-latest nightly --all-features	3m 57s
test ubuntu-latest 1.85	43s
deny / cargo deny check	33s
test windows-latest stable	2m 31s
ci success	4s
	1h 13m 38s

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