rfc: Lazy-load fee beneficiary in mainnet handler #4260

Job	Run time
check no_std	32s
check	17s
check no_std kzg-rs	29s
clippy	1m 30s
check serde	26s
check std	22s
test stable --no-default-features	56s
docs	1m 24s
fmt	5s
test stable	50s
test stable --all-features	1m 29s
test beta --no-default-features	54s
TyposCheck	8s
test beta	51s
test beta --all-features	1m 21s
test nightly --no-default-features	47s
test nightly	43s
test nightly --all-features	1m 7s
	14m 11s

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