Enhance MergeMeshes with mixed field support

RELEASE-NOTES.md

@@ -28,6 +28,8 @@ The Axom project release numbers follow [Semantic Versioning](http://semver.org/
 - Quest: Adds OMP support for fast GWN methods for STL/Triangulated STEP input and linearized NURBS Curve input.
 - Quest: Adds OMP supported, fast and accurate GWN method for NURBS curves and trimmed NURBS surfaces.
 - Klee: Adds an optional "center" parameter in scale operators that permits scaling relative to a custom center point.
+- Bump: The `MergeMeshes` class was enhanced so it supports material-dependent/mixed Blueprint fields that are "element-associated". These fields contain per-material values for the materials in a zone.
+- Bump: Added `axom::bump::views::dispatch_material_field()` function (and related functions) for creating a material view and a material-dependent or mixed field view.
 - Quest: `SamplingShaper` now supports selecting MFEM quadrature families for custom sample-point generation, including
   anisotropic per-direction sampling resolution on quadrilateral and hexahedral meshes. Quadrature type is selected via
   a new ``setQuadratureType`` method that accepts an enum value from ``mfem::Quadrature1D``. The number of samples in
@@ -44,6 +46,7 @@ The Axom project release numbers follow [Semantic Versioning](http://semver.org/
 - Inlet: Added the ability to have collections (array and dictionary) with variant user defined structures.
 
 ### Removed
+- Bump: Removed `axom::bump::views::MultiBufferMaterialView`, which was a view type for an obsolete flavor of Blueprint matset.
 
 ### Deprecated
 - Core: Deprecates the pointer-based interface to linear-, quadratic- and cubic- polynomial solvers in favor of an ArrayView-based interface

src/axom/bump/CMakeLists.txt

@@ -45,6 +45,7 @@ set(bump_headers
     views/BasicIndexing.hpp
     views/dispatch_coordset.hpp
     views/dispatch_material.hpp
+    views/dispatch_material_field.hpp
     views/dispatch_rectilinear_topology.hpp
     views/dispatch_structured_topology.hpp
     views/dispatch_topology.hpp
@@ -53,6 +54,7 @@ set(bump_headers
     views/dispatch_utilities.hpp
     views/ExplicitCoordsetView.hpp
     views/MaterialView.hpp
+    views/MixedFieldView.hpp
     views/NodeArrayView.hpp
     views/RectilinearCoordsetView.hpp
     views/Shapes.hpp

src/axom/bump/ExtractZones.hpp

@@ -41,7 +41,6 @@ class ExtractZones
    *
    * \param topoView The input topology view.
    * \param coordsetView The input coordset view.
-   * \param matsetView The input matset view.
    */
   ExtractZones(const TopologyView &topoView, const CoordsetView &coordsetView)
     : m_topologyView(topoView)