LanguageClient: Request semantic tokens right away on document save

There's a good argument to be made that a doument save should bypass the
usual waiting period for requesting new semantic tokens.

Fixes: QTCREATORBUG-27403
Change-Id: I8355147116bccdcbcd4f6689b4d9c7a282d324be
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/languageclient/client.h

@@ -102,7 +102,8 @@ public:
 
     enum class SendDocUpdates { Send, Ignore };
     void sendMessage(const LanguageServerProtocol::JsonRpcMessage &message,
-                     SendDocUpdates sendUpdates = SendDocUpdates::Send);
+                     SendDocUpdates sendUpdates = SendDocUpdates::Send,
+                     Schedule semanticTokensSchedule = Schedule::Delayed);
 
     void cancelRequest(const LanguageServerProtocol::MessageId &id);