feat: Add scheduled campaigns support

[OmarBrbutovic]

What this PR does / why we need it:

Add support for scheduled campaigns, allowing users to create campaigns that will be automatically launched at a specified future date and time.

Additional documentation e.g. usage docs, diagrams, reviewer notes, etc.:

Screenshots

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Image 2 :

Image 3:

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[lusergit]

I can't even nitpick this

[Dam-99]

[lusergit]

/fast-forward 🥳