feat(genesis): EIP 1559 System Config Accessor #625

Job	Run time
doctest	1m 19s
cfg-check	46s
clippy	57s
docs	1m 0s
feature-checks	2m 50s
feature-powerset	4m 19s
fmt	16s
no-std	56s
test stable --no-default-features	1m 3s
test stable	1m 5s
wasm-unknown	58s
wasm-wasi	58s
test stable --all-features	1m 25s
test nightly --no-default-features	1m 16s
test nightly	1m 26s
test nightly --all-features	1m 32s
test 1.81 --no-default-features	58s
test 1.81	57s
	24m 1s

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