IVGCVSW-8497: DTS Fixing unsupported types (Acc backends)

 * Added DataTypes::Signed64 to StackQueueDescriptor::Validate,
   ReverseV2QueueDescriptor::Validate, SpaceToDepthQueueDescriptor::Validate,
   GatherNdQueueDescriptor::Validate
 * Added DataTypes::Signed32 to SpaceToDepthQueueDescriptor::Validate,
   StridedSliceQueueDescriptor::Validate,
   DepthToSpaceQueueDescriptor::Validate
 * Added Neon and Cl Layer Tests for Stack Signed64 type,
   SpaceToDepth Signed64 and Signed32 types, Strided Slice Signed32 type,
   GatherNd Signed64 type
 * Added Neon and Cl End to End tests for DepthToSpace Signed32 type
 * Added Cl End to End test for ReverseV2 Signed64 type
 * Added int64_t explicit specialization for armnn:Quantize (TypesUtils.cpp)
 * Added arm_compute::DataType::S64 support to CopyOutTo() and CopyInFrom()
   in ClTensorHandle.hpp and NeonTensorHandle.hpp

Signed-off-by: Martin Klacer <martin.klacer@arm.com>
Change-Id: I04acd53768b932c04bafc1104038766ffb02c149