Stack trace format defintion

[Wodann]

Definition of done

• We need to define a Rust type to represent a solidity stack trace.
• It should be similar to https://github.com/NomicFoundation/hardhat/blob/main/packages/hardhat-core/src/internal/hardhat-network/stack-traces/solidity-stack-trace.ts
• We don't want to copy 1:1 though, as that version has a design error: it mixes information about the solidity stack trace, the decoded returndata, and errors inferred by us. This limits how we can present it to the user.
• Our new format should be exclusively about the stack trace information.