Add new benchmark : Arepo

[gokmenkilic]

• [x] Write a Spack Recipe

This recipe only include yee_2d simulation, we need to add variants for other simulations.

I have tried to add this but it did not worked for me:

variant(
        'config', 
        default='yee_2d', 
        values=(
            'wave_1d', 
            'shocktube_1d',
            'polytrope_1d_spherical',
            'noh_3d',
            'noh_2d',
            'mhd_shocktube_1d',
            'isolated_galaxy_collisionless_3d',
            'interacting_blastwaves_1d',
            'gresho_2d',
            'galaxy_merger_star_formation_3d',
            'current_sheet_2d',
            'cosmo_zoom_gravity_only_3d',
            'cosmo_box_star_formation_3d',
            'cosmo_box_gravity_only_3d',
            'alfven_wave_1d'
        ),
        description='Choose config file'
    )

• [x] Write a Reframe Test