[FEATURE]: Add OpenTofu support

[ashwiren]

Feature Request

Background / Motivation

Without getting into drama etc opentofu is an opensource fork of terraform

What should the user be able to do?

Use opentofu provider the same as terraform provider

Why do they want to do this? What problem does it solve?

Suggested Implementation(s)

For now opentofu 1.6 is a 1:1 implementation of all of terraform 1.5 features plus some 1.6 features so the most/all of the work to support opentofu as a provider should be able to leavage what already exists for terraform.

How important is this feature for you/your team?

Currently this is a nice to have but platforms like gitlab are planning to switch from terraform support to opentofu support and are phasing out their terraform support in a med/long term so it would be better to have a transition plan sorted out early

🥀 Crucial, Garden is unusable for us without it

[kvendingoldo]

At this moment if you need to have a support of Terraform as well as OpenTofu (and Terragrunt :) ) in one tool you can use https://github.com/tofuutils/tenv which my team wrote some months ago. A lot of users switched to that tool to unify version management in the world of Terraform.

You're welcome to open any issues or contribute to tenv.