Use `GenerateResourceConfig` RPC to generate config instead of using the `tfadd` if the server support it

Since `terraform` v1.14.0, there will be a new RPC protocol `GenerateResourceConfig` that allows the provider to generate a precise config instead of using `tfadd`. We shall check whether the target provider supports that, if so, we use this new method, otherwise fallback to using `tfadd`.

This requires the support of the new interfaces in `terraform-client-go`.

This also requires to add a check on the terraform version (with tf mode), if less than v1.14.0, still using `tfadd`. Gradually, we shall deprecate `tfadd` if all the azure providers have supported the new RPC protocol.

Reference: https://github.com/hashicorp/terraform/pull/37515