[Test] Add unit tests for newly added tensor type

This PR adds unit tests for the recently implemented tensor data types.
The purpose is to ensure their functionality and correctness by performing various test cases.

**Changes proposed in this PR:**
- Added unit tests to test functions for CharTensor and ShortTensor
- Check if both tensor data are contiguous before copy()

**Self-evaluation:**
1. Build test: [X]Passed [ ]Failed [ ]Skipped
2. Run test:   [X]Passed [ ]Failed [ ]Skipped

Signed-off-by: Donghyeon Jeong <dhyeon.jeong@samsung.com>

nntrainer/tensor/tensor.cpp

@@ -898,7 +898,7 @@ size_t Tensor::getOffset() const { return itensor->getOffset(); }
 
 void Tensor::copy(const Tensor &from) {
   /// @todo enable copy to non-contiguous tensor
-  if (!itensor->getContiguous()) {
+  if (!itensor->getContiguous() || !from.getContiguous()) {
     throw std::runtime_error("Cannot copy non-contiguous tensor");
   }