Indent a json string by unmarshalling it and marshalling it with MarshalIndent.

MustIndent behaves like Indent but will panic on errors.

MustMarshal behaves like json.Marshal but will panic on errors.

MustMarshalIndent behaves like json.MarshalIndent but will panic on errors.

MustUnmarshal behaves like json.Unmarshal but will panic on errors.