Support opentofu

[Rui Chen]

Would be good to support opentofu, as it is also GA recently with 1.6.0

[Arthur Busser]

Agreed.

The -terraform-bin flag allows users to run tofu init and tofu plan instead of terraform init and terraform plan:

tfautomv -terraform-bin=tofu

What more would be needed, or desired actually, to support OpenTofu?