Draft: Generate file for benchmark

Context

Added multiple templates to benchmark the stm32h7

Modified files

• benchmark.py can generate main.c and call functions
• main_stm32h7/f7.jinja, main fuinctions for theses board which call a determined function
• print_output.jinja, to generate print_output.hpp which can be called by main_stm32h7.jinja, and print the output tensor after a forward

TODO

• compare_output.jinja
• compute_time.jinja
• Move gen methods into benchmark.py
• fix main.c from stm32f7 board file (maybe on another MR)