Merge branch 'knepley/feature-lumped-quadrature' into 'main'

DT+FE: Add quadrature for diagonal mass matrices

See merge request petsc/petsc!8584

DT+FE: Add quadrature for diagonal mass matrices
- More work to do here
- Add PetscDTCreateQuadratureByCell()
- Allow quadrature type to be set from options