huge refactor for high RewritePatterns usage and less ad-hoc cpp code

remove Spatial many ops in favor of tensor ops like in pim

src/PIM/Conversion/SpatialToPim/ChannelLoweringPatterns.hpp

@@ -0,0 +1,9 @@
+#pragma once
+
+#include "mlir/IR/PatternMatch.h"
+
+namespace onnx_mlir {
+
+void populateChannelLoweringPatterns(mlir::RewritePatternSet& patterns);
+
+} // namespace onnx_mlir