feat: add fft_ifft2 base (#183)

* feat: add `fft_ifft2` base

* fix: add trailing newline to base header

Author: voltjia

src/base/fft_ifft2.h

@@ -0,0 +1,43 @@
+#ifndef INFINI_OPS_BASE_FFT_IFFT2_H_
+#define INFINI_OPS_BASE_FFT_IFFT2_H_
+
+#include "operator.h"
+
+namespace infini::ops {
+
+class FftIfft2 : public Operator<FftIfft2> {
+ public:
+  FftIfft2(const Tensor input, const std::vector<int64_t> dim, Tensor out)
+      : input_shape_{input.shape()},
+        input_strides_{input.strides()},
+        input_type_{input.dtype()},
+        out_shape_{out.shape()},
+        out_strides_{out.strides()},
+        out_type_{out.dtype()},
+        dim_{dim},
+        device_index_{out.device().index()} {}
+
+  virtual void operator()(const Tensor input, const std::vector<int64_t> dim,
+                          Tensor out) const = 0;
+
+ protected:
+  Tensor::Shape input_shape_;
+
+  Tensor::Strides input_strides_;
+
+  DataType input_type_;
+
+  Tensor::Shape out_shape_;
+
+  Tensor::Strides out_strides_;
+
+  DataType out_type_;
+
+  std::vector<int64_t> dim_{};
+
+  int device_index_{0};
+};
+
+}  // namespace infini::ops
+
+#endif