Extract username from basic auth and forward it to backends

[zhaohuabing]

I would ask for an update of the basic auth in the SecurityPolicy to extract the username and add it to the headers sent to the backends.

The use case is the following, after user auth success I need to add the username in the request header that will be used by the application after.

This depends on the Envoy upstream PR: envoyproxy/envoy#32943

[github-actions]

This issue has been automatically marked as stale because it has not had activity in the last 30 days.

[github-actions]

This issue has been automatically marked as stale because it has not had activity in the last 30 days.

[akorosi]

+1

[s0uky]

+1
Is there some progress in this issue, pls?
Thank you

EDIT: I'm asking, because this PR is closed for some reason: #3312