New kernel drivers, filesystem API, and more (#513)

* **New Features**
  * BMI270 6-axis IMU driver added; new unified filesystem abstraction for mounted filesystems.
  * Public Wi‑Fi API surface (no implementation yet)
  * SDMMC driver added (kernel drive$)
  * expanded GPIO interrupt/callback support
* **Improvements**
  * M5Stack Tab5: revamped GPIO/power initialization and IMU integration.
  * LVGL updates including device fontSize configuration.
  * Updated all code related to SD card device/fs handling
  * Rename LilyGO T-HMI S3 to LilyGO T-HMI
* **Bug Fixes**
  * Simplified and consolidated SD card handling and mount discovery.

Devices/lilygo-thmi/device.properties

@@ -0,0 +1,23 @@
+[general]
+vendor=LilyGO
+name=T-HMI
+
+[apps]
+launcherAppId=Launcher
+
+[hardware]
+target=ESP32S3
+flashSize=16MB
+spiRam=true
+spiRamMode=OCT
+spiRamSpeed=120M
+tinyUsb=true
+esptoolFlashFreq=120M
+
+[display]
+size=2.8"
+shape=rectangle
+dpi=125
+
+[lvgl]
+colorDepth=16