feat: add eip2124 forkid (#25) #89

Job	Run time
docs	33s
cfg-check	23s
doctest	35s
clippy	26s
feature-checks	59s
fmt	10s
no-std	17s
test ubuntu-latest stable --no-default-features	22s
wasm-wasi	25s
wasm-unknown	25s
test ubuntu-latest stable	25s
test ubuntu-latest stable --all-features	30s
test ubuntu-latest nightly --no-default-features	29s
test ubuntu-latest nightly	27s
test ubuntu-latest nightly --all-features	35s
test ubuntu-latest 1.81 --no-default-features	24s
test ubuntu-latest 1.81	22s
test windows-latest stable --no-default-features	1m 49s
test windows-latest stable	1m 51s
test windows-latest stable --all-features	2m 36s
test windows-latest nightly --no-default-features	1m 27s
test windows-latest nightly	1m 13s
test windows-latest nightly --all-features	1m 25s
test windows-latest 1.81 --no-default-features	1m 9s
test windows-latest 1.81	1m 27s
	20m 44s

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