feat(alloy-rpc-types-eth): Optional serde #3931

Job	Run time
test ubuntu-latest stable --no-default-features	1m 25s
test ubuntu-latest stable	1m 14s
check no_std	21s
clippy	39s
test ubuntu-latest stable --all-features	1m 30s
test ubuntu-latest nightly --no-default-features	1m 10s
doctest	1m 44s
test ubuntu-latest nightly	1m 16s
feature-checks	3m 42s
test ubuntu-latest nightly --all-features	1m 22s
test ubuntu-latest 1.79 --no-default-features	57s
wasm-unknown	1m 2s
wasm-wasi	1m 54s
test ubuntu-latest 1.79	1m 0s
cfg-check	34s
test windows-latest stable --no-default-features	4m 55s
docs	1m 11s
fmt	11s
test windows-latest stable	4m 54s
test windows-latest stable --all-features	4m 42s
test windows-latest nightly --no-default-features	3m 48s
test windows-latest nightly	3m 46s
test windows-latest nightly --all-features	3m 50s
test windows-latest 1.79 --no-default-features	2m 39s
test windows-latest 1.79	2m 32s
	52m 18s

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