* Refactor cpu/builder/dot.cpp

* Support only float and i64

* Refactor softmax and reduction to support only float and i64

* Add a new file for customized kernels

* Add compile time flag NGRAPH_CPU_LARGE_BINARY

* Add compilation flag checks in reduction.hpp

* change dot to only support float and i64

* Revert "Refactor cpu/builder/dot.cpp"

This reverts commit 0d53f27fde64872aff096f12ee9b79e5db7a7fee.

* style

* Consolidate macros

* Refactor slice ops, reshape & pad

* cleanup

* Gather op

* Concat, Convert and broadcast op

* Tile and reverse_sequence op

* Scatter_add op

* ET other then fp and i64 go through ref

* tests passing

* Consolidate macros

* Address feedback

* Fall back to reference for pad and reshape

* add scatter_add reference fallback

* Undo concat change

* Undo tile and update slice as they dont have reference implementation

* Remove update slice condition

* Gather op type check

* change routine name

* Build-time configurability for datatypes that requires optimized kernels on CPU backend (#3592)

* Inline function

* Change condition

* VS compiler workaround

* Add comment for VS workaround

* More fixes for VS

* More wrapping of nested macros for VS

* More wrapper

* variable name change and more wrapping of macros

* test

* Style and refactor

* Wrap macros

* Add a seperate macro for SELECT_KERNEL

* Change SELECT_KERNEL_3ARGS

* Unwrap couple of macros

* Syntax

* Add a new macro for fixed number of args for VS compiler

* Comment/Fake ectx

* Add detailed comment for the workaround for VS compiler

* Comment all unused ectx variables

* Templated calls to reference kernels

* const args

* Change softmax ref definition to take double

* Hardcode softmax kernel to take double ..testing

* Fix softmax