Display alternative provider names in provider panel

[dbanck]

Background

In #701, we introduced a provider panel with a list of providers for a module.

Problem Statement

The current implementation displays the type, namespace, version constraints and installed version of each provider. Users can only know what alternative names are providers available under by finding and reading the relevant part of the configuration (i.e. required_providers block).

Expected User Experience

Users can see any alternative name for each provider in the same pane alongside provider requirements.

Proposal

• Update the LS workspace command terraform-ls.module.providers (introduced in Introduce list module providers command terraform-ls#712) to include a list of alternative names
• Update the client-side panel to include those names

Notes

• When deciding on the UI details, keep in mind that we also want to display provider aliases (Display provider aliases in provider panel #856).