feat(protocol): enable ETH deposit from L1 to L2 using withdrawalsRoot [1]

[dantaik]

This PR enables depositing from Ethereum to Taiko using the new withdrawalsRoot field.
A potential attack is that someone uses this approach to deposit large amount of Ether then use the Bridge to take Ether back to L1, then repeat this process until the Ether balance of an account overflows. Therefore, we cap the amount of Ether that can be deposited per L2 block.

Future optimizations are stated here: #13621

[dantaik]

A potential attack is that someone uses this approach to deposit large amount of Ether then use the Bridge to take Ether back to L1, then repeat this process until the Ether balance of an account overflows. Therefore, we cap the amount of Ether that can be deposited per L2 block.

(2**256)/(100,000,000*(10**18)) ~= 10**50, looks like we'll be safe even without a cap. :)

Agreed, the current cap is there to force people to pay more fees :)