samples: net: sockets: http_server: Dont block system workq #93537
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Since the netstats handler calls on functions which reach deep into the networking stack, there is a lot of points actually at which it can be blocked, even forever. So having this handler on the system workqueue is not a good idea and can even cause a deadlock in some cases if it's blocked waiting on a synchronization primitive that would be given by a work item scheduled later in the queue. Therefore, make a workqueue specifically for this http server socket instead of using the system one.
Fixes #92652