[Fjord] Add FastLZ compression into L1CostFunc + Refactor

[pcw109550]

Mirror ethereum-optimism/op-geth#249

[ImTei]

Looks good 👍 but we have few things to deduplicate and cleanup code.
In erigon-lib/opstack/rollup_cost.go,

• extractL1GasParamsPreEcotone and extractL1GasParamsPostEcotone have some duplicated lines with extractL1GasParamsLegacy and extractL1GasParamsEcotone. we can reuse code.
• New L1 cost logic must be applied to existing other methods: L1Cost, l1CostHelper, L1CostFnForTxPool

[pcw109550]

Looks good 👍 but we have few things to deduplicate and cleanup code. In erigon-lib/opstack/rollup_cost.go,

• extractL1GasParamsPreEcotone and extractL1GasParamsPostEcotone have some duplicated lines with extractL1GasParamsLegacy and extractL1GasParamsEcotone. we can reuse code.
• New L1 cost logic must be applied to existing other methods: L1Cost, l1CostHelper, L1CostFnForTxPool

Fixed at #179