refactor: change input type

This patch brings following changes:
1) At this moment we didn't take any input,
so all matrices are hardcoded
2) All vectors now have GrB_Vector type
3) For every edge and veretex type have been
created corresponding GrB types
4) Add some go-style "err != nil"-driven-development

Signed-off-by: Rodion Suvorov <rodion.suvorov.94@mail.ru>

Author: suvorovrain