Add zkSync Era [don't merge] [duplicates fork]

[arwer13]

This PR duplicates fork changes provided by https://github.com/txfusion/lido-l2/commit/0c6214d20f18186a6eb2cdfb1b42f50761f2dc5d to add more redundancy in keeping track of the code deployed on-chain.

It is not planned for merging (at least yet) due to the merge conflicts.