Updates to ZkSync contract deployments

We have made some improvements with respect to prebuilt contract deployments on ZkSync chains.

While it doesn't change the deployment process and experience for most users, there are some key changes as described below:

• All thirdweb contracts can now be deployed on any ZkSync chain without any intervention from us, for existing and new ZkSync chains in the future
• All contracts deployed that way are auto verified using standard solc metadata, which means you can view source and interact with them on the dashboard even if they're not verified on block explorers