feat: Implement WrapError for Option

[jalil-salame]

Implement WrapError for Option<T>. This is inline with anyhow that also implements Context for Option<T>.

The implementation requires us to introduce a DisplayError internal only type, that creates an error from a type that only implements Display (Report::from_adhoc requires the type to also implement Debug, but WrapError only requires it to implement Display).

For this I copied MessageError and adapted it to implement Debug using the underlying type's Display impl. This is a bit of a hack, but anyhow does something similar.

Closes #408

[jalil-salame]

If you want I can also create a pub(crate) fn from_display in Report that does the same as from_adhoc but without the Debug bound (using DisplayError instead of MessageError).