[Feature]: Add data resource for obtaining subnet deatils based on its ID

[vladimirtiukhtin]

What whould you like to see?

A data resource similar to hcloud_network for obtaining subnet details based on its ID. Thank you

[apricote]

Small issue is, that subnets do not have any IDs in the API. They are only identified through their IP Range.

I think it would be best to return this inside the data.hcloud_network resource.

[github-actions]

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