Expose metadata about a module via custom command

[radeksimko]

Current Version

0.15.0

Use-cases

Similar to how symbols provide a high-level overview of the code structure:

We can provide some kind of overview of the providers in use which were parsed for a given module, e.g.

provider.aws - hashicorp/aws (~> 3.0): 3.1.0
provider.grafana - grafana/grafana (>= 2.0): 2.3.1

Relatedly we can also highlight what TF version is required and available, e.g.

Terraform ~> 0.14 (0.14.9)

Proposal

Expose a custom command, such as moduleinfo which can expose details about the module's metadata that can be leveraged by clients and potentially somehow displayed in the UI.

Such command could just pull all that info out of the state store.

The only question is how do we ensure that the client always has up-to-date data - it would likely need to be requesting the data all the time, similar to how the old rootmodules command is wired in the VS Code extension.

[radeksimko]

This was implemented as part of #712

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