Forked from managed_components (espressif/bh1750, espressif/aht20,
esp-idf-lib/sgp40) and rewrote aht20/sgp40 internals to use
driver/i2c_master.h directly instead of the i2c_bus and i2cdev
wrapper components, so all three sensors share one create/delete
handle pattern over a single i2c_master_bus_handle_t.
