Add main application logic and touch handling functionality

- Implemented main application entry point in main.cpp, initializing queues and event groups.
- Created TouchHandler and EInkTouchHandler classes for handling touch events.
- Added a minimal event loop for touch processing in touch.cpp.
- Introduced unit tests for the hello world application in pytest_hello_world.py.
- Added configuration files for CI and Wokwi support.
- Created empty header files for network and UI modules.

main/CMakeLists.txt

@@ -0,0 +1,5 @@
+file(GLOB SRCS "main.cpp" "*.cpp" "*.c" "**/*.cpp" "**/*.c")
+idf_component_register(SRCS ${SRCS}
+                       PRIV_REQUIRES
+                         spi_flash
+                       INCLUDE_DIRS "." "display" "touch" "network" "ui" "io" "common")