[Feature]: Migrate to TF Plugin Framework

[apricote]

What whould you like to see?

Terraform has launched a new "Plugin Framework" that replaces the Plugin SDK v2. This new framework supports some advanced scenarios that currently do not work properly. It can help us solve a number of bugs that we are experiencing:

• SDK v2 only supports "int" while Plugin Framework supports explicit "int64" types (Related to hcloud-go v2, [Bug]: Issues with IDs on 32-bit system/binaries #997, [Feature]: Update to hcloud-go v2 #877)
• Plugin Framework supports strongly typed access to fields, which will help with a number of issues I discovered while trying to migrate to hcloud-go v2
• Terraform 1.4 introduced a bug for nested sets with computed fields ([Bug]: Since upgrading to terraform 1.4.x, the provider keeps trying to remove and re-assign private networks #650). This would be fixed by switching to Plugin Framework
• Plugin Framework has a number of util functions regarding Diagnostics ([Feature]: Properly show warnings to the user through Diagnostics #692) that make them easier to use.
• SDK v2 only supports binary ForceNew for schema attributes. For hcloud_server.server_type it makes sense to ForceNew when switching between x86 and Arm, but to keep the same server and scale it in case the architecture stays the same. This is supported by the Plugin Framework. See [Bug]: Changing hcloud server from arm64 to x86 results in an error #853
• For hcloud_server.public_net we have some bugs that are caused by the "Set" type for this argument. These can only be fixed in the Plugin Framework. See [Bug]: After importing hcloud_server terraform plan is showing fields to be updated #944 and fix(server): migration to explicit primary IPs fails #597 (comment)

This migration will be a huge refactoring effort. We plan on doing it in many smaller steps, migrating a couple of resources at a time.

• feat: setup initial plugin framework skaffolding #749
• Migrate individual resources/datasources
  • Certificates
    • hcloud_certificate
    • hcloud_uploaded_certificate
    • hcloud_managed_certificate
    • data.hcloud_certificate
    • data.hcloud_certificates
  • Datacenter
    • data.hcloud_datacenter refactor: move data.hcloud_datacenter(s) to Plugin Framework #779
    • data.hcloud_datacenters refactor: move data.hcloud_datacenter(s) to Plugin Framework #779
  • Firewall
    • hcloud_firewall
    • hcloud_firewall_attachment
    • data.hcloud_firewall
    • data.hcloud_firewalls
  • Floating IPs
    • hcloud_floating_ip
    • hcloud_floating_ip_assignment
    • data.hcloud_floating_ip
    • data.hcloud_floating_ips
  • Image
    • data.hcloud_image
    • data.hcloud_images
  • Load Balancer
    • hcloud_load_balancer
    • hcloud_load_balancer_network
    • hcloud_load_balancer_service
    • hcloud_load_balancer_target
    • data.hcloud_load_balancer
    • data.hcloud_load_balancers
  • Location
    • data.hcloud_location refactor: move data.hcloud_location(s) to Plugin Framework #796
    • data.hcloud_locations refactor: move data.hcloud_location(s) to Plugin Framework #796
  • Network
    • hcloud_network
    • hcloud_network_subnet
    • hcloud_network_route
    • data.hcloud_network
    • data.hcloud_networks
  • Placement Group
    • hcloud_placement_group
    • data.hcloud_placement_group
    • data.hcloud_placement_groups
  • Primary IP
    • hcloud_primary_ip
    • data.hcloud_primary_ip
    • data.hcloud_primary_ips
  • RDNS
    • hcloud_rdns
  • Server
    • hcloud_server
    • hcloud_server_network
    • data.hcloud_server
    • data.hcloud_servers
  • Server Type
    • data.hcloud_server_type refactor: move data.hcloud_server_type(s) to Plugin Framework #959
    • data.hcloud_server_types refactor: move data.hcloud_server_type(s) to Plugin Framework #959
  • Snapshot
    • hcloud_snapshot
  • SSH Key
    • hcloud_ssh_key refactor: move data.hcloud_ssh_key(s) to Plugin Framework #817
    • data.hcloud_ssh_key refactor: move data.hcloud_ssh_key(s) to Plugin Framework #817
    • data.hcloud_ssh_keys refactor: move data.hcloud_ssh_key(s) to Plugin Framework #817
  • Volume
    • hcloud_volume
    • hcloud_volume_attachment
    • data.hcloud_volume
    • data.hcloud_volumes
• Clean up remaining SDK v2 usages
• Clean up old provider & muxing

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