Remove old HAL components and refactored GPS-related code (#583)

- Added generic GPS/GNSS support with device detection, configuration, and persistent settings.
- Improved device and module lifecycle management.
- Added flexible filesystem locking support for displays and storage.
- Improved display-idle and keyboard backlight handling.
- Updated architecture, driver, module, testing, and licensing documentation.
- Removed old HAL device and related code.

Modules/gps-module/private/gps/private/gps_ledger.h

@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: Apache-2.0
+#pragma once
+
+/**
+ * @brief Reconciles the device tree against the persisted GPS configurations (see
+ * gps/gps_settings.h): constructs+adds (but does not start) a GPS_TYPE device for every
+ * configuration that doesn't have one yet, and stops+destructs+removes any ledger-owned device
+ * whose configuration has disappeared.
+ *
+ * Only ever touches devices the ledger itself created (tagged DEVICE_FLAG_DYNAMIC) - devicetree-
+ * declared GPS_TYPE devices (tagged DEVICE_FLAG_DTS) are never constructed, started, stopped, or
+ * destructed by the ledger.
+ */
+void gps_ledger_sync();
+
+/**
+ * @brief Stops+destructs+removes every ledger-owned device. Devicetree-declared GPS_TYPE devices
+ * are left untouched.
+ */
+void gps_ledger_clear();