Enhanced module support

[radeksimko]

Problem Statement

Terraform users use modules to package and reuse configuration. Users should not loose out on UX they get when editing resources, data sources etc. directly after "modularising" their configs and when leveraging 3rd party modules.

User Impact

Any users of modules will benefit.

Expected User Experience

Most UX features evolve around the module block.

The overall aim is to help users introduce new modules to the configuration and help manage existing modules and increase the chance that user will be provided with the following

• completion
• hover
• accurate highlighting
• relevant links (to docs)
• go to references/definitions
• installation/update via contextual code actions

for all modules in their configuration regardless of where the module comes from or whether it's installed.

Proposal

• Support module inputs and outputs #668
• Go to (local) module implementation from source #669
• Go to variable definition (from local module arg) #670
• Completion of module source and version #672
• Link to (remote) module docs from module source #673
• Display module hierarchy in the UI #698
• Go to module output declaration from reference #706
• Recognize inputs and outputs of uninitialized local modules terraform-ls#598
• Recognize inputs and outputs of uninitialized remote (Terraform Registry) modules terraform-ls#599
• Support single files and parent (non-Terraform) folders terraform-ls#32
• Allow subscribing to updates of module.calls data terraform-ls#722
• Allow subscribing to updates of module.providers data terraform-ls#723
• Use configuration as the primary source for module.calls terraform-ls#725
• Deprecate rootmodules custom command terraform-ls#515

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