[FEATURE REQUEST] Problem Case without Type and wrap errors that are usable with erros.Is(...)

Sample:

```go

_, err := os.ReadFile("/tmp/dat_not_found")
newProblem := iris.NewProblem().Wrap(err)

ctx.StopWithProblem(
iris.StatusInternalError,
iris.NewProblem().
Key("error", true).
Key("success", false).
Title("Request failed").
Detail("Processing did not finish").
Cause(newProblem),
)

```

Maybe a Wrap thet will be output and one SilentWrap that is only for internal use.

Ref: https://github.com/mschneider82/problem/tree/master