Fixed Jacobi and SOR so that code using getLinearSolver() and a distributed matrix can be compiled (even if the solvers do not work...)

Added dummy methods reduceRows, reduceAllRows, forElements, forAllElements, forRows, forAllRows to DistributedMatrix

The IsArrayType trait does not include TNL::String...

Polygonal + polyhedral mesh

See merge request !93

It was broken because the MeshBuilder interface was changed due to
polygonal and polyhedral meshes, but tnl-decompose-mesh was not built on
the CI due to a missing optional dependency (metis).

See MR !107

- refactored a few for cycles in EntityInitializer to use ParallelFor
- modified function findEntitySeedIndex in Initializer to use find instead of insert
- modified FPMAReaderTest to use slightly bigger mesh for testing
- added a few explanatory comments
- deleted unused methods from SubentitySeedsCreator
- created specialization of Formatter in Assert.h for std::pair to avoid compilation error caused by calling inplaceExclusiveScan on array of pairs

Added EntityInitializerLayer specialization for initializing polyhedron subentites 3 -> 2 from cell seeds + other minor mesh refactoring

Refactored mesh initialization to reduce number of calls to SubentitySeedsCreator and number of dynamic allocations

removed redundant subentitiesCounts array from SubentityStorageLayer of dimension 1 for polygonal meshes

Meshes/Geometry: refactored polygon and polyhedron decomposition into templated EntityDecomposer struct with specializations

- added function getPlanarMesh for correcting non-planar polygons in 3D polygon and polyhedral meshes
- added unit tests for getPlanarMesh function
- refactored getDecomposedMesh specialization for polygons by creating PolygonDecomposer struct to reuse decomposing logic in getPlanarMesh function
- other minor refactoring in Meshes/MeshGeometryTest.h

- modified getEntityMeasure specialization for polyhedrons to remove restriction regarding the ordering of vertices, but now it only works for convex polyhedrons
- added function for decomposing polygonal mesh into triangular mesh
- added function for decomposing polyhedral mesh into tetrahedral mesh

- added getEntityMeasure specializations for 2D and 3D polygon, pyramid, wedge, polyhedron
- added unit tests for new getEntityMeasure specializations
- added function isPlanar for checking whether all points of a 3D polygon are on the same plane
- added unit test for function isPlanar
- refactored isDynamicTopology type trait to avoid warning

- added wedge and pyramid topologies
- modified mesh initialization related classes to handle wedge and pyramid topologies
- added entries for wedge and pyramid into VTKTraits, MeshTypeResolver, tnl-mesh-converter
- added unit tests for mesh with two wedges and mesh with two pyramids