consensus: make `Header` blob fees u64 (#1377) #4200

Job	Run time
doctest	1m 5s
feature-checks	3m 1s
wasm-unknown	58s
test ubuntu-latest stable --no-default-features	1m 9s
test ubuntu-latest stable	1m 31s
wasm-wasi	1m 10s
test ubuntu-latest stable --all-features	2m 26s
check no_std	21s
test ubuntu-latest nightly --no-default-features	1m 19s
test ubuntu-latest nightly	1m 14s
clippy	38s
test ubuntu-latest nightly --all-features	2m 5s
test ubuntu-latest 1.79 --no-default-features	39s
docs	58s
test ubuntu-latest 1.79	48s
fmt	14s
cfg-check	32s
test windows-latest stable --no-default-features	5m 51s
test windows-latest stable	3m 21s
test windows-latest stable --all-features	7m 24s
test windows-latest nightly --no-default-features	3m 4s
test windows-latest nightly	4m 26s
test windows-latest nightly --all-features	4m 26s
test windows-latest 1.79 --no-default-features	2m 7s
test windows-latest 1.79	3m 46s
	54m 33s

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