* Quantize the bias to int32

* Bias scale fix

* mnist works

* Quantize Bias

* Introduce Quantize op in the graph to quantize bias & feedback

* Add QuantizedConvBiasAdd

* Comments and some refactoring

* Add test case with float bias and enable int32 as quantized type in ngraph

* Change shape of scale from Shape{} to Shape{1} in the backend

* Add QuantizedConvBiasSignedAdd

* Fix Layouts, clean up and a test case for QCBA

* Test case for QCBSA

* cleanup mkldnn_emitter.hpp

* fix build error

* Constant fold