module metadata: Decode module calls (for uninitialized modules)

[radeksimko]

Background

Currently, when it comes to understanding relationships between modules (in completion, hover, go-to-definition etc.) we only consider module manifest within .terraform available after modules are installed.

Expecting users to always install modules just to gain the IntelliSense however may be asking for too much.

The following issues represent relevant work that depends on this:

• Recognize inputs and outputs of uninitialized local modules #598
• Use configuration as the primary source for module.calls #725
• Completion of module source and version from Terraform Registry #869

Proposal

terraform-schema

• Extend earlydecoder to also decode module blocks minimally (in version-agnostic way)
• Add ModuleCalls to module.Meta

terraform-ls

• state: Add ModuleCalls to state.ModuleMetadata
• state: Ensure ModuleStore.ModuleCalls() returns module calls from the configuration in addition to module manifest

[github-actions]

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