Port the BME280 from baremetal STM32 to TockOS userland using libtock-c I2C master syscalls

[Hoi-Tong]

Goal:
Port the BME280 sensor driver from STM32 bare-metal firmware to a TockOS userspace application using libtock-c I2C syscalls, with the goal of getting working sensor readings.

Changes:

• Replaced STM32 HAL I2C calls (HAL_I2C_Mem_Read/Write) with i2c_master_write_sync and i2c_master_read_sync
• Replaced HAL_Delay with libtocksync_alarm_delay_ms
• Removed STM32-specific code and added a simple main to test the sensor
• Kept the core BME280 driver logic unchanged

What it does:

• Code compiles and runs
• Sensor initialization succeeds
• I2C communication is partially working as it is able to read chip ID and other registers
• However, all sensor output values are blank

Why sensor data is blank:

• Sensor is not configured correctly
• No data is produced

Ref: jlab-sensing/ENTS-node-firmware stm32/lib/bme280/src/bme280.c