[Feature] support delete several applications in one command

[wonderflow]

Is your feature request related to a problem? Please describe.

When I want to delete more than one apps, I have to do it one by one.

vela delete composed-app -y
vela delete frp-proxy -y
vela delete vela-app-with-sidecar -y
vela delete ecs-demo -y

It's annoying when I have many apps.

Describe the solution you'd like

I hope we can delete them together at once:

vela delete composed-app frp-proxy vela-app-with-sidecar ecs-demo

Describe alternatives you've considered

Additional context

[StevenLeiZhang]

It sounds a little dangerous. Do you think user should double confirm batch delete?

[wonderflow]

yes, user need confirm.

[charlie0129]

With optional regular expression support? So the user can match multiple apps following some pattern.

[Mcduller]

I was wondering if user can delete app in different namespace by this new feature ?

[wonderflow]

I was wondering if user can delete app in different namespace by this new feature ?

I think they shouldn't

[ArenaSu]

/assign