Add mesh boundary gluing (post facial-adjacency overhaul) (#253)

* add mesh boundary gluing

* add generate_annular_cylinder_slice_mesh

* add tests for facial adjacency transforms and mesh boundary gluing

* check for facial adjacency transforms in map_mesh

* add facial adjacency transform handling in affine_map

* add periodic argument to generate_box_mesh/generate_regular_rect_mesh

* make arguments keyword-only in generate_box_mesh

Co-authored-by: Andreas Klöckner <inform@tiker.net>

* reference glue_mesh_boundaries in generate_box_mesh and generate_regular_rect_mesh

* fix doc reference

* report information about vertices that could not be matched

* disable nodal adjacency in glued meshes

* use list/set comprehensions

* use dataclass for boundary mappings

* split mapping_face_id_pairs into two variables

* remove sorting matching faces by group

not needed anymore, I think

* specify order of intra-match indices in _match_faces_by_vertices

* document _match_boundary_faces

* don't do face matching twice

* add numpy vertex matching for small cases

* Bump down cutoff for tree algorithm in face matching

To avoid giant temporaries.

Co-authored-by: Andreas Klöckner <inform@tiker.net>