implement Dead Letter Queue (DLQ)

[arhimede]

Feature Request

Q	A
New Feature	yes
RFC	no
BC Break	no

Summary

we need to build a special redis command
which return DLQ

using some dummy data, try to send emails using bad credentials
that way, you will see in Redis queue failed messaged, which cannot pe processed

[arhimede]

DLQ is implemented already in Symfony messenger
So be sure we are not inevnting again the weel