[mlir] Improvements to the 'quant' dialect (#100667)

Full revamp of the 'quant' dialect. This is an implementation for the
RFC at
https://discourse.llvm.org/t/rfc-improvements-in-the-quant-dialect/79942

Author: rafaelubalmw

mlir/lib/CAPI/Dialect/Quant.cpp

@@ -8,12 +8,12 @@
 
 #include "mlir-c/Dialect/Quant.h"
 #include "mlir/CAPI/Registration.h"
-#include "mlir/Dialect/Quant/QuantOps.h"
-#include "mlir/Dialect/Quant/QuantTypes.h"
+#include "mlir/Dialect/Quant/IR/Quant.h"
+#include "mlir/Dialect/Quant/IR/QuantTypes.h"
 
 using namespace mlir;
 
-MLIR_DEFINE_CAPI_DIALECT_REGISTRATION(quant, quant, quant::QuantizationDialect)
+MLIR_DEFINE_CAPI_DIALECT_REGISTRATION(quant, quant, quant::QuantDialect)
 
 //===---------------------------------------------------------------------===//
 // QuantizedType