Revert "Revert "feat: support vscode multi-root workspaces (#2594)" (#2612)"

This reverts commit 621253d.

Author: acao

.changeset/thick-years-sort.md

@@ -0,0 +1,9 @@
+---
+"vscode-graphql": patch
+"graphql-language-service-server": patch
+"graphql-language-service-cli": patch
+---
+
+support vscode multi-root workspaces! creates an LSP server instance for each workspace.
+
+WARNING: large-scale vscode workspaces usage, and this in tandem with `graphql.config.*` multi-project configs could lead to excessive system resource usage. Optimizations coming soon.