docs: Add debugging tips for Cosmos programs #302
Description
Debugging for Cosmos programs is currently in a bad state due to CosmWasm returning cosmos-sdk wrapped errors in the SubMsgResult after executing from the processor. Instead of getting explicit smart contract errors we just get a standard code5: contract execution failed returned.
Because of this we need to document alternatives for users to be able to debug what went wrong in the program. For example, simulating the execution of the messages with the account as the sender directly via CLI