Add optional user message to Web3Exception #2798
Description
What was wrong?
It would be nice to add an optional user message on the Web3Exception class that would allow us to communicate info about the exception to users. It came up in the context of #2796. In that case, we only return the info from the node, but we get a lot of questions about what the node error info means. It would be nice if we could include the error message from the node along with a hint to the users.