Support for `workspace/diagnostic` from LSP 3.17

Tracking issue for support on the LSP [`workspace/diagnostics`](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#workspace_diagnostic) request. Getting this working would be a major win over `typescript-language-server` and `vtsls` to get project wide diagnostics in editors where all issues are detected before each individual file is open the current reliance on `didOpen` makes editor workspace diagnostics less reliable.