OPA 1.0

[anderseknert]

Work has begun integrating what will soon be OPA 1.0. Creating this issue to collect things we'll need to do for Regal to provide the best possible experience for users, no matter what version of OPA they use. To start:

• How do we determine what version OPA/Rego to lint for?
  • Configuration / flags / auto-detection?
  • Probably all of the above — auto-detection and suggest changing configuration
  • Ideally, no user upgrading should have to do anything ... but we can recommend settings
• Ensure no obsolete rules (use-rego-v1, use-if, use-contains, more?) are enabled when OPA 1.0 is detected
• Language server commands need to consider this too
  • Formatting
  • Evaluation
  • Linting
• Parse bundle manifests and Rego versions from there?

I'm sure there is much more... will add to the list as I work on this.

[anderseknert]

Fixed with #1317