Delegate scalar arithmetic ops to function versions
Delegate scalar arithmetic ops to function versions

Earlier to this change, the arithmetic trait implementations used to
call the C-API directly.

arrayfire/arrayfire_rust,9prady9/arrayfire-rust,9prady9/arrayfire-rust,arrayfire/arrayfire-rust,9prady9/arrayfire-rust,arrayfire/arrayfire-rust,9prady9/arrayfire-rust,arrayfire/arrayfire-rust