[export_arm_cortexm] Arm CortexM lowbit export toolchain definition and integration in aidge

First steps

• Generate configuration files for STM32-F746ZG & STM32-H743ZI
• Run lowbit MAC kernel on F7 & H7 :
  • Mac 8W/8A
  • Mac 4W/8A
  • Mac 4W/4A
  • Mac 1W/8A
  • Mac 1W/7A
  • Mac 1W/5A
  • Mac 1W/4A
• Runtime benchmark for convolution in each precision configuration
• Test conv2D with Weights Interleaving

Arm CortexM lowbit export toolchain Definition

Merge requests

Core : aidge_core!262 (merged)

Backend_cpu : aidge_backend_cpu!111 (merged)

Export_arm_cortexm : !16 (merged)

Aidge bundle : aidge!87 (merged)

Fix on Quantization : aidge_quantization!25 (merged)