[tf-quant] Add TF compositions for the floating-point and integer tfl.conv2d
[tf-quant] Add TF compositions for the floating-point and integer tfl.conv2d

These ops are added as examples to show how to use the tf composite api. The
composition contains the some tfr built-ins ops which haven't been supported.
Simple unit tests, by comparing the floating-point and integer compositions,
are added to verify the correctness of the implementation.

There are some issues to be fixed:
- support per-channel quantization scales
- the tfr translator support for the built-in ops.

PiperOrigin-RevId: 371212467
Change-Id: Ifc04d21f0bb2a63ef97c8c594845f912c6f78435

frreiss/tensorflow-fred,tensorflow/tensorflow,tensorflow/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,paolodedios/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,tensorflow/tensorflow-experimental_link_static_libraries_once,karllessard/tensorflow,paolodedios/tensorflow,gautam1858/tensorflow,Intel-tensorflow/tensorflow,gautam1858/tensorflow,Intel-tensorflow/tensorflow,karllessard/tensorflow,sarvex/tensorflow,Intel-Corporation/tensorflow,tensorflow/tensorflow-pywrap_saved_model,Intel-tensorflow/tensorflow,sarvex/tensorflow,Intel-tensorflow/tensorflow,yongtang/tensorflow,gautam1858/tensorflow,yongtang/tensorflow,tensorflow/tensorflow,tensorflow/tensorflow,karllessard/tensorflow,paolodedios/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,paolodedios/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,Intel-Corporation/tensorflow,tensorflow/tensorflow,karllessard/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,frreiss/tensorflow-fred,tensorflow/tensorflow-pywrap_tf_optimizer,frreiss/tensorflow-fred,sarvex/tensorflow,karllessard/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,paolodedios/tensorflow,paolodedios/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,tensorflow/tensorflow-pywrap_tf_optimizer,yongtang/tensorflow,sarvex/tensorflow,gautam1858/tensorflow,Intel-tensorflow/tensorflow,frreiss/tensorflow-fred,Intel-Corporation/tensorflow,karllessard/tensorflow,sarvex/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,Intel-tensorflow/tensorflow,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow-pywrap_saved_model,Intel-tensorflow/tensorflow,yongtang/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow,gautam1858/tensorflow,frreiss/tensorflow-fred,frreiss/tensorflow-fred,tensorflow/tensorflow,Intel-Corporation/tensorflow,tensorflow/tensorflow-pywrap_saved_model,Intel-Corporation/tensorflow,sarvex/tensorflow,yongtang/tensorflow,paolodedios/tensorflow,paolodedios/tensorflow,sarvex/tensorflow,Intel-tensorflow/tensorflow,tensorflow/tensorflow-pywrap_saved_model,yongtang/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,tensorflow/tensorflow-pywrap_tf_optimizer,tensorflow/tensorflow-experimental_link_static_libraries_once,karllessard/tensorflow,tensorflow/tensorflow,Intel-tensorflow/tensorflow,Intel-Corporation/tensorflow,frreiss/tensorflow-fred,frreiss/tensorflow-fred,paolodedios/tensorflow,frreiss/tensorflow-fred,tensorflow/tensorflow-experimental_link_static_libraries_once,yongtang/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,tensorflow/tensorflow-pywrap_saved_model,yongtang/tensorflow,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow,tensorflow/tensorflow-pywrap_saved_model,sarvex/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,paolodedios/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow-pywrap_saved_model,Intel-Corporation/tensorflow,Intel-tensorflow/tensorflow,karllessard/tensorflow,frreiss/tensorflow-fred,tensorflow/tensorflow-pywrap_tf_optimizer,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow-experimental_link_static_libraries_once,gautam1858/tensorflow,karllessard/tensorflow,yongtang/tensorflow,karllessard/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,frreiss/tensorflow-fred,tensorflow/tensorflow,karllessard/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,gautam1858/tensorflow,paolodedios/tensorflow,yongtang/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,Intel-Corporation/tensorflow,gautam1858/tensorflow,frreiss/tensorflow-fred,tensorflow/tensorflow-pywrap_saved_model,Intel-tensorflow/tensorflow,yongtang/tensorflow