DAP: Add Python debugging

Added Python support to the DAP engine in Qt Creator.

Note:
Locals aren't displayed for python. It will be fixed
in the following commit.

Change-Id: I6d3b41fecc98b92951ed0522e9201401293034d7
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: hjk <hjk@qt.io>

src/plugins/debugger/dap/dapengine.h

@@ -84,7 +84,7 @@ protected:
     void claimInitialBreakpoints();
 
     void handleDapStarted();
-    void handleDapLaunch();
+    virtual void handleDapInitialize();
     void handleDapConfigurationDone();
 
     void dapRemoveBreakpoint(const Breakpoint &bp);