Describe the feature

Currently we do not support autocomplete/suggestions for keys under the lsp object in settings (not even the name of available language servers) so users are forced to operate blindly.

Beyond that we could actually support JSON schema for autocompleting LSP-specific settings when available.

Language Server Configuration JSON Schema links:

• https://github.com/yioneko/vtsls/blob/main/packages/service/configuration.schema.json
• https://github.com/python-lsp/python-lsp-server/blob/develop/pylsp/config/schema.json