have explicit flag to have quarkus devui enabled

[maxandersen]

Description

if you don't add resteasy or at least vertx-core you don't get a devui by default when running quarkus dev.

We should have something like quarkus dev --ui which would use the new feature of adding extensions on the fly to provide the minimal extension to have devui running even on non-http extensions like kafka/grpc/command mode.

Implementation ideas

p.s. i'm 80% sure I already opened this but couldn't find it.

[quarkus-bot[bot]]

/cc @cescoffier (devui), @phillip-kruger (devui)

[maxandersen]

@iocanel would this be a simple enough to do? seems like a nice easy win using the new dynamic add?

[iocanel]

I need to check

[maxandersen]

duplicate of #33088