Implement support for module symbols (#475)

* **New Features**
  - Adds module symbol support and per-module symbol tables, including LVGL symbol exports moved into a dedicated table.
* **API**
  - Adds symbol-resolution APIs and an accessor to enable dynamic lookup between modules.
* **Bug Fixes / Chores**
  - Explicitly initializes module symbol pointers across device and platform modules to avoid uninitialized state.
* **Tests**
  - Updates tests to account for symbol pointer initialization.

Devices/lilygo-tdisplay/Source/module.cpp

@@ -16,7 +16,8 @@ static error_t stop() {
 struct Module device_module = {
     .name = "lilygo-tdisplay",
     .start = start,
-    .stop = stop
+    .stop = stop,
+    .symbols = nullptr
 };
 
 }