Create im2row hifi cpp kernel tests (#15123)

Summary:
Pull Request resolved: #15123

### Summary

This diff adds a new test for the `im2row_out` operator in the Cadence HiFi backend. The test is added in the `test_op_im2row_out.cpp` file and is compilable on both fbcode and xplat.

The test includes a new function `im2row_out` in the `operators.h` file, which is declared but not defined. The definition of this function is not provided in this diff.

The test file `test_op_im2row_out.cpp` includes the necessary headers and uses the `gtest` framework for testing. It also includes some utility functions from the `executorch` library.

Overall, this diff adds a new test for the `im2row_out` operator in the Cadence HiFi backend, but does not provide the implementation of the operator itself.

Reviewed By: mcremon-meta

Differential Revision: D84639802

Author: zonglinpeng

backends/cadence/hifi/operators/operators.h

@@ -191,6 +191,28 @@ void quantized_add_asym8uxasym8u_asym8u_per_tensor_out(
     int64_t out_zero_point,
     ::executorch::aten::Tensor& out);
 
+void im2row_out(
+    ::executorch::runtime::KernelRuntimeContext& ctx,
+    const ::executorch::aten::Tensor& input,
+    ::executorch::aten::IntArrayRef kernel_size,
+    ::executorch::aten::IntArrayRef dilation,
+    ::executorch::aten::IntArrayRef padding,
+    ::executorch::aten::IntArrayRef stride,
+    const ::executorch::aten::Tensor& in_zero_point,
+    bool channel_last,
+    ::executorch::aten::Tensor& out);
+
+void im2row_per_tensor_out(
+    ::executorch::runtime::KernelRuntimeContext& ctx,
+    const ::executorch::aten::Tensor& input,
+    ::executorch::aten::IntArrayRef kernel_size,
+    ::executorch::aten::IntArrayRef dilation,
+    ::executorch::aten::IntArrayRef padding,
+    ::executorch::aten::IntArrayRef stride,
+    int64_t in_zero_point,
+    bool channel_last,
+    ::executorch::aten::Tensor& out);
+
 } // namespace native
 } // namespace HiFi
 } // namespace impl