examples: add Gyro FFT using CMSIS 5 on Cortex-m (#15104)

- this is a work in progress experiment to compute real time FFTs from raw gyro FIFO data on Cortex-m hardware (stm32f4/f7/h7, etc)

src/systemcmds/topic_listener/CMakeLists.txt

@@ -47,6 +47,7 @@ px4_add_module(
 	MODULE systemcmds__topic_listener
 	MAIN listener
 	COMPILE_FLAGS
+	STACK_MAIN 4096
 	INCLUDES
 		${CMAKE_CURRENT_SOURCE_DIR}
 		${CMAKE_CURRENT_BINARY_DIR}