Add support for BSRs to sptrsv (kokkos#2281)

* Some cleanup and refactoring

* First round of cleanup complete

* Fix a couple warnings

* formatting

* Cleanup progress

* Fixes

* Remove Upper/Lower TriLvlSchedTP2SolverFunctors

* Remove Upper/Lower single block functors

* Remove unused TriLvlSchedTP1SingleBlockFunctorDiagValues and merge upper/lower tri_solve_cg

* Merge two big upper/lower branch of tri_solve_chain

* Merge upper/lower tri_solve_streams

* progres

* progress

* Progress, test added

* progress and fixes

* prog

* prog but broken

* Prog with debug prints

* Remove extreme debug printing

* works

* all working

* Remove test mangling

* Switch over block spiluk precond test to use new block sptrsv

* More test cleanup

* Fixes for GPU warnings

* Conflicts resolved, still work needed

* builds

* Formatting

* Update work to latest format style

* Remove unused functions. Remove prints. Add barriers

* Minor fixes

* lset is not used

* Fix for clang

* formatting

* New impl approach

* Unset macro

* There's no reason to limit team-policy alg to MAX_VEC_SIZE

* formatting

* Add missing kokkos-inline-funcs

* Fix warnings

* format