sysutils/opentofu: New port

OpenTofu is an OSS tool for building, changing, and versioning
 infrastructure safely and efficiently. OpenTofu can manage existing and
 popular service providers as well as custom in-house solutions.

The key features of OpenTofu are:

- Infrastructure as Code: Infrastructure is described using a high-level
  configuration syntax. This allows a blueprint of your datacenter to be
  versioned and treated as you would any other code. Additionally,
  infrastructure can be shared and re-used.

- Execution Plans: OpenTofu has a "planning" step where it generates an
  execution plan. The execution plan shows what OpenTofu will do when
  you call apply. This lets you avoid any surprises when OpenTofu
  manipulates infrastructure.

- Resource Graph: OpenTofu builds a graph of all your resources, and
  parallelizes the creation and modification of any non-dependent
  resources. Because of this, OpenTofu builds infrastructure as
  efficiently as possible, and operators get insight into dependencies
  in their infrastructure.

- Change Automation: Complex changesets can be applied to your
  infrastructure with minimal human interaction. With the previously
  mentioned execution plan and resource graph, you know exactly what
  OpenTofu will change and in what order, avoiding many possible human
  errors.

WWW: https://opentofu.org