[multidomain][facet] introduce grid manager and pull out grid data

dumux/multidomain/facet/CMakeLists.txt

dumux/multidomain/facet/box/couplingmapper.hh

dumux/multidomain/facet/cellcentered/tpfa/couplingmapper.hh

dumux/multidomain/facet/codimonegridadapter.hh

dumux/multidomain/facet/couplingmapper.hh

dumux/multidomain/facet/couplingmapperbase.hh

dumux/multidomain/facet/gmshreader.hh

dumux/multidomain/facet/gridmanager.hh

...main/facet/1p_1p/analytical/test_facetcoupling_fv_1p1p.cc

...p/threedomain/test_facetcoupling_tpfa_1p1p_threedomain.cc

test/multidomain/facet/CMakeLists.txt

test/multidomain/facet/grid.msh

test/multidomain/facet/test_couplingmapper_boundary.input

test/multidomain/facet/test_facetcouplingmapper.cc

test/multidomain/facet/test_facetcouplingmapper_boundary.cc

test/multidomain/facet/test_gridmanager.cc

test/multidomain/facet/test_gridmanager.input

test/multidomain/facet/test_vertexmapper.cc

test/multidomain/facet/test_vertexmapper.input