MueLu: Remove Xpetra dependency

[stmcgovern]

MueLu has required dependencies on Xpetra and Tpetra (among other packages). Let's remove the required dependency on Xpetra.

[github-actions[bot]]

Automatic mention of the @trilinos/muelu team

[mperrinel]

• [ ] Compilation of MueLu without xpetra and without

  • MueLu_Level.hpp (xpetra lib member variables + getter and setter to remove)
  • MueLu_Utilities_decl.hpp (plenty of xpetra methods to remove or modify)
  • Belos Adapter: BelosXpetraStatusTestGenResSubNorm.hpp
  • MueLu_UtilitiesBase_decl.hpp (plenty of helper functions using Xpetra::Matrix to change to Tpetra ?)

• [ ] Compilation of MueLu without xpetra and with test:

Activating tests automatically activates examples: Files need to be update from xpetra to teptra:

What do we do with : XPETRA_ADD_TEST_TPETRA

• [ ] ReuseSequence

How to migrate from xpetra to tpetra: Xpetra::global_size_t -> Tpetra::global_size_t Xpetra::Access::ReadOnly -> Tpetra::Access::ReadOnly Xpetra::Map -> Tpetra::Map Xpetra::Vector -> Tpetra::Vector Xpetra::MultiVector -> Tpetra::MultiVector