Geofencing - Align with new model

[bigludo7]

Problem description
We have decided some months ago to move to CloudsEvent model for subscription. Now, the documentation is available in commonalities, in the design document, and with a yaml template.

Our Geofencing API should now be updated accordingly to this new model.

Expected behavior

Align geofencing API with this model.
This move will de facto solve #124

Alternative solution

Additional context

@maxl2287 as you did a great job on this API could we expect you to continue the work for this issue?

[maxl2287]

I will take it in account and try to resolve it asap 🫡

[maxl2287]

@bigludo7 PR is open, if you want to take a look. 🚀

[bigludo7]

@bigludo7 PR is open, if you want to take a look. 🚀

Thanks @maxl2287 ! This is great.
I've also do the same work for simswap-subscription so if you can take a look here.
As we're both 'pionner' on this work probably good that we're aligned :)