[mlir][NFC] Cleanup AffineOps directory structure

Summary:
Change AffineOps Dialect structure to better group both IR and Tranforms. This included extracting transforms directly related to AffineOps. Also move AffineOps to Affine.

Differential Revision: https://reviews.llvm.org/D76161
diff --git a/mlir/lib/Transforms/LoopFusion.cpp b/mlir/lib/Transforms/LoopFusion.cpp
index 378e91a..2f08f95 100644
--- a/mlir/lib/Transforms/LoopFusion.cpp
+++ b/mlir/lib/Transforms/LoopFusion.cpp
@@ -14,7 +14,7 @@
 #include "mlir/Analysis/AffineStructures.h"
 #include "mlir/Analysis/LoopAnalysis.h"
 #include "mlir/Analysis/Utils.h"
-#include "mlir/Dialect/AffineOps/AffineOps.h"
+#include "mlir/Dialect/Affine/IR/AffineOps.h"
 #include "mlir/IR/AffineExpr.h"
 #include "mlir/IR/AffineMap.h"
 #include "mlir/IR/Builders.h"