Improve error handling with snafu, thiserror or anyhow

You could try some crates such as [snafu](https://github.com/shepmaster/snafu), [thiserror](https://crates.io/crates/thiserror) or [anyhow](https://docs.rs/anyhow/latest/anyhow/).

_Originally posted by @pedro-h-dias in https://github.com/programandonocosmos/cashtools-api/pull/8#discussion_r979319134_