chore(sequencer): consolidate all action handling to one module #7030

Job	Run time
run_checker / changes	6s
protos-compiled	33s
compiles	1m 31s
solidity-contracts-compiled	1m 15s
lockfile	17s
audit	0s
rust	2m 10s
rust-ethereum	1m 9s
clippy	58s
doctest	1m 44s
custom-lints	5m 52s
test / success	1s
	15m 36s

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