Use registry schema cache if no initialized data for providers

[paultyng]

Use-cases

• Brand new workspaces (or newly added providers) have no init data
• Unable to init workspace for some reason (ie. only init/plan/apply via CI/CD, etc)

Proposal

The Terraform registry can provide an endpoint that serves the schema JSON for a provider. The LS can use this endpoint to pull the information to the local provider schema cache in scenarios where a root module / local init is not present/possible.

[bcline760]

Is this issue on your roadmap? The way my company does our Terraform structure, it is unfeasible to run terraform init on all directories to obtain autocompletion and intellisense. As such, I'm without these key features of the extension.

This sounds like a good feature and would benefit the LS.