Enable progressive IntelliSense updates

[Colengms]

• Enables progressive IntelliSense updating ( Generate IntelliSense results progressively #7759 )
• Updates all visible documents/editors instead of just the active document/editor.
• Made semantic token and inlay hint providers simpler. Their purposes are now only to trigger VS Code requests for these as the native side pushes them down to the TypeScript side.
• Removes delaying of didOpen, which previously was used to defer TU creation until a file was actually made visible. Instead, the native side will only perform a TU update once it receives a separate visibility notification.
• Fixed some issues with messages being processed out of order.