chore: flatten eip-7685 requests into a single opaque list #4598

Job	Run time
clippy	44s
check no_std	29s
cfg-check	23s
doctest	1m 13s
docs	56s
fmt	13s
feature-checks	3m 49s
wasm-unknown	59s
test ubuntu-latest stable --no-default-features	1m 28s
wasm-wasi	1m 20s
test ubuntu-latest stable	1m 23s
test ubuntu-latest stable --all-features	2m 32s
test ubuntu-latest nightly --no-default-features	1m 13s
test ubuntu-latest nightly	1m 10s
test ubuntu-latest nightly --all-features	2m 10s
test ubuntu-latest 1.79 --no-default-features	39s
test ubuntu-latest 1.79	36s
test windows-latest stable --no-default-features	3m 29s
test windows-latest stable	4m 11s
test windows-latest stable --all-features	4m 47s
test windows-latest nightly --no-default-features	3m 24s
test windows-latest nightly	3m 24s
test windows-latest nightly --all-features	4m 43s
test windows-latest 1.79 --no-default-features	1m 48s
test windows-latest 1.79	2m 6s
	49m 9s

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