refactor: Restructure project into sources/tests layout and dissolve PluginLLMCore

sources/logger/CMakeLists.txt

@@ -0,0 +1,16 @@
+add_library(QodeAssistLogger STATIC
+    IRequestPerformanceLogger.hpp
+    Logger.cpp
+    Logger.hpp
+    RequestPerformanceLogger.hpp RequestPerformanceLogger.cpp
+)
+
+target_link_libraries(QodeAssistLogger
+    PUBLIC
+    Qt::Core
+    QtCreator::Core
+)
+
+target_include_directories(QodeAssistLogger
+    PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}
+)