EIP-7702: change chain_id type to U256 (#21) #83

Job	Run time
doctest	25s
no-std	11s
wasm-unknown	12s
test ubuntu-latest stable --no-default-features	14s
test ubuntu-latest stable	11s
cfg-check	13s
test ubuntu-latest stable --all-features	42s
clippy	19s
test ubuntu-latest nightly --no-default-features	18s
test ubuntu-latest nightly	19s
docs	14s
test ubuntu-latest nightly --all-features	37s
feature-checks	19s
test ubuntu-latest 1.81 --no-default-features	16s
test ubuntu-latest 1.81	17s
test windows-latest stable --no-default-features	55s
fmt	12s
wasm-wasi	17s
test windows-latest stable	1m 9s
test windows-latest stable --all-features	2m 18s
test windows-latest nightly --no-default-features	50s
test windows-latest nightly	1m 2s
test windows-latest nightly --all-features	1m 3s
test windows-latest 1.81 --no-default-features	42s
test windows-latest 1.81	48s
	14m 3s

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