Display provider requirements/installed in the UI

[radeksimko]

Use Cases

While providers can practically only be defined in a single place in config, it may not always be quick and easy to find that place and understand the implications.

Users would benefit from seeing what providers are required and installed for their module at a quick glance.

Expected User Experience

The expectation is that we'd use Tree View API, which would look approximately like this:

we may also consider adding the view directly under the Explorer menu, similar to this example from VS Code docs:

User would be able to see:

• provider requirements for the module(s) being edited
• provider versions installed for the module(s) being edited
• any alternative names which each provider is available
• any aliases under which each provider is available
• right click to update outdated provider
• right click to go to the docs of the provider, where applicable (Terraform Registry)

We may also consider implementing this as a WebView https://code.visualstudio.com/api/extension-guides/webview

Proposal

• decide UI details - i.e. what exact metadata and how we display
• expose the relevant module data from LS via custom command
• implement the client-side while leveraging the data from LS obtained via custom command

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