#131: Galeri: Add Tpetra tests

[thearusable]

Closes #131

Tests found under the test, example* directories.

Folder	Epetra Tests (Main file name)	Conversion Status
test/VerySimple	cxx_main.cpp	Partial
example	Map.cpp	Full
example	CrsMatrix.cpp	Partial
example	VbrMatrix.cpp	NO
example	LinearProblem.cpp	Partial

• VbrMatrix.cpp - This test can't be converted because it's using a Epetra::VbrMatrix which doesn't exists in Tpetra package. It was present at some point in the past but it was deprecated and removed from the package as stated in the Release Notes: https://github.com/NexGenAnalytics/Trilinos/blob/NGA-FY23-develop/packages/tpetra/ReleaseNotes.txt#L438
• cxx_main.cpp / LinearProblem.cpp - Those two have a creation of necessary objects for calculations done, but there are no linear solvers in Galeri/Tpetra package which could be used to solve the problem. I added a comment that those solvers can be found for example in Amesos2 or Ifpack2.
• CrsMatrix.cpp - Original tests used a helper method which generated and printed a 2D stencil of the matrix. I didn't found any good replacement for that, and I didn't create my own.

In the tests there are methods used from Galeri::Xpetra namespace so they will require Xpetra to be enabled.