LibDebug: Add ability to detach from debuggee

Author: https://github.com/itamar8910
Commit: 8ce641cefc
Pull-request: https://github.com/SerenityOS/serenity/pull/3606
Issue: https://github.com/SerenityOS/serenity/issues/3308
Reviewed-by: https://github.com/awesomekling

Libraries/LibDebug/DebugSession.cpp

@@ -266,4 +266,12 @@ void* DebugSession::single_step()
     return (void*)regs.eip;
 }
 
+void DebugSession::detach()
+{
+    for (auto& breakpoint : m_breakpoints.keys()) {
+        remove_breakpoint(breakpoint);
+    }
+    continue_debugee();
+}
+
 }