ClangCodeModel: Support parse contexts with clangd

Fixes: QTCREATORBUG-27009
Change-Id: I177db0658d545211b940623cae071db91e82ddb4
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/clangcodemodel/clangdclient.h

@@ -25,6 +25,7 @@
 
 #pragma once
 
+#include <cppeditor/baseeditordocumentparser.h>
 #include <cppeditor/cppcodemodelsettings.h>
 #include <cppeditor/refactoringengineinterface.h>
 #include <languageclient/client.h>
@@ -88,6 +89,9 @@ public:
 
     static void handleUiHeaderChange(const QString &fileName);
 
+    void updateParserConfig(const Utils::FilePath &filePath,
+                            const CppEditor::BaseEditorDocumentParser::Configuration &config);
+
 signals:
     void indexingFinished();
     void foundReferences(const QList<Core::SearchResultItem> &items);