feat: Delete enhancements

[chrischrischris]

Implement total count and max amount of items to delete allowed.

I upped the max delete amount to 1000 for now. Or should we make it configurable?

Implements part of #861

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[kptdobe]

Re-thinking about it.. there are always scenarii where you really want to delete a folder with a lot of mess in it.

What about something like:

• if less than 10, delete
• between 10 and 1000, user has to write "DELETE" to confirm this is really what they want to do
• contact admin if more than 1000

WDYT ?

[auniverseaway]

I think 1000 is fine.

[auniverseaway]

I like @kptdobe suggestions.