ShyLU - Basker : replace View-of-Views with std::vector-of-Views

[iyamazaki]

@trilinos/shylu

Motivation

This PR replaces the view-of-views in ShyLU-Basker (which was causing deadlocks) with vector-of-views.

Testing

Additional Information

It also serializes some parallel-fors, where the memory allocation is performed within.