Support multiple transactions per block

[eigmax]

This function involves the components below:

• [x] eigen zeth @captainlee1024 https://github.com/0xEigenLabs/reth/pull/1 #36
• [x] bridge service @BC-A https://github.com/0xEigenLabs/eigen-bridge-service/pull/8
• [x] bridge contract : add integration test @JangoCCC https://github.com/0xEigenLabs/eigen-bridge-contracts/pull/4

[eigmax]

For the deposit txn, the bridge-service need to watch all the BridgeAsset event, and store the EMT root with current txId. @BC-A

For the withdrawal txn, it's included in a batch for the sequenceBatch and verifyBatch. In each verifyBatch, the L2 EMT root has been sent to L1.

All the claim should be happened one by one.