Migrate to Terraform Plugin Framework

[k-yomo]

Terraform Plugin Framework is the next major version of Terraform Plugin SDKv2(this provider is currently using).
https://developer.hashicorp.com/terraform/plugin/framework

There are newly added features in Terraform Plugin Framework.
https://developer.hashicorp.com/terraform/plugin/which-sdk#do-you-need-more-features-than-sdkv2-provides

If you maintain a large existing provider, we recommend that you begin migrating from SDKv2 to the framework by developing new resources and data sources with the framework. You can use terraform-plugin-mux to refactor the provider over time. Refer to the Migrate to Terraform Plugin Framework documentation for more details.

We may want to gradually migrate resources and data-sources to use Terraform Plugin Framework as recommended in the doc.

[k-yomo]

Terraform Plugin Framework 1.0 is now GA
https://www.hashicorp.com/blog/terraform-plugin-framework-is-now-generally-available