Add Tests for Strongly Typed Indices for TensorIndex

[rchen20]

Is your feature request related to a problem? Please describe.

In #1738, it was discovered that TensorIndex did not handle strongly typed indices, and was fixed directly in that PR.

Describe the solution you'd like

Tests using strongly typed indices with TensorIndex are missing, and we should add them. The cases which need covering are:

VectorIndex<strongtypedindex, vector>
RowIndex<strongtypedindex, vector>
ColIndex<strongtypedindex, vector>

See RAJA/benchmarks/ltimes.cpp for use cases.

[rchen20]

Also check whether this implementation of range() should be index_type or value_type. Use range() with strongly typed indices in tests.

RAJA/include/RAJA/pattern/tensor/TensorIndex.hpp

Line 67 in 6280cd6

self_type range(index_type begin, index_type end){