Update to terraform-plugin-framework 1.2.0

[zxaos]

Using #179 as a base:

• update framework version to 1.2.0
• update base provider and app data source to new framework style

There's lots of changes between our version of the plugin framework and the current one.

[zxaos]

@DAlperin this is large, but a lot of it is just updating syntax.

IIRC the things that are not just updating syntax:

• providerConfig + Configure calls for each resource rather than having them reach into the provider to pull out the graphql and http clients
• forcing failure on an empty volume id response
• enforcing volume name syntax matching what flyctl says
• removal of internalid from the volumes resources
• replacement of KVToTfMap with types.MapValueFrom
• removal of the custom plan modifier for ips to set them to global. This is handled now with just some logic in the datasource and with a stringdefault in the resource