Move NextDNS data update coordinators to the coordinator module

[bieniu]

Breaking change

Proposed change

Moves data update coordinator classes to the coordinator module.

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[joostlek]

Maybe for a future PR, since the update interval differs on coordinator type, you could probably make that a class variable on the coordinator itself

[bieniu]

Hmm good idea, added to my todo list.

[frenck]

Thanks, @bieniu 👍

../Frenck