fix(bitscrambler): validate and safely load LUT data

Reject LUT loads that exceed the hardware address space and assemble
each 32-bit LUT word via memcpy so unaligned and partial inputs do not
read past the caller buffer. Add regression tests for oversized and
partial unaligned LUT loads.

components/esp_driver_bitscrambler/include/driver/bitscrambler.h

@@ -89,6 +89,7 @@ esp_err_t bitscrambler_load_program(bitscrambler_handle_t handle, const void *pr
  * @return
  *        - ESP_OK
  *        - ESP_ERR_INVALID_ARG: Invalid handle or lut pointer
+ *        - ESP_ERR_INVALID_SIZE: LUT data exceeds hardware capacity
  */
 esp_err_t bitscrambler_load_lut(bitscrambler_handle_t handle, void *lut, size_t size_bytes);