Search registry providers via completion

[paultyng]

Use-cases

• Adding a provider to a workspace, need to search available providers that aren't present locally

Proposal

Use a registry / algolia search endpoint to source possible providers based on a query.

[radeksimko]

This is now tracked under the following issues:

• Add required_providers entry on provider completion #370
• Provide completion for required_providers #371
• Install/upgrade provider via required_providers code lens #299
• New Code Action: Generate missing required_providers entry #480

[github-actions]

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