Different handling of dynamic layout between cairo_lang & cairo_vm

[fmoletta]

In cairo_vm, setting the layout to dynamic sets the builtin's ratios to None & sets all other layout parameters to a constant value. In cairo_lang, setting the layout to dynamic forces you to also submit a json file with the layout params. We should investigate how this is handled in cairo_lang to ensure the same behaviour

[juanbono]

This will be addressed by #1716

[fmoletta]

This will be addressed by #1716

Its a different issue