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[Feature] Add CUDA support for `min` and `max` reducer in heterogeneous API for unary message functions (#3566)

* CUDA support max/min reducer on forward pass

* docstring

* concised UpdateGradMinMax_hetero

* reorganized UpdateGradMinMax_hetero

* CUDA kernels for max/min reducer

* variable name

* lint check

* changed CUDA 2D thread mapping to 1D

* removed legacy cusparse for min/max reducer

* git CI issue

* restarting git CI

* adding namespace std
Co-authored-by: Israt Nisa <nisisrat@amazon.com>
Co-authored-by: Quan (Andy) Gan <coin2028@hotmail.com>

* min/max support for forward CPU heterograph

* Added etype with each argU values

* scatter_add needs fix

* added scatter_add_hetero. Grads dont match for max reducer

* storing ntype in argX

* fixing scatter_add_hetero

* hetero matches with torch's scatter add

* works copy_e forward+cpu

* added backward for copy_rhs

* Computes gradient for all node types in one kernel

* bug fix

* unnitest for max/min on CPU

* renamed scatter_add_hetero to update_grad_minmax_hetero

* lint check and comment out cuda call for max. Code is for CPU only

* lint check

* replace inf with zero

* minor

* lint check

* removed LIBXSMM code from hetro code

* fixing backward operator of UpdateGradMinMaxHetero

* removed backward from update_grad_minmax_hetero

* docstring

* improved docstring and coding style

* Added pass by pointer for output

* typos and pass by references

* Support for copy_rhs

* Added header <string>

* fix bug in copy_u_max

* Added comments and dimension check of all etypes

* skip mxnet check

* pass by pointer output arrays

* updated docstring
Co-authored-by: Israt Nisa <nisisrat@amazon.com>
Co-authored-by: Quan (Andy) Gan <coin2028@hotmail.com>

* [CPU, Parallel] Rewriting omp pragmas with parallel_for

* [CPU, Parallel] Decrease number of calls to task function

* c[CPU, Parallel] Modify calls to new interface of parallel_for

* upd

* fix

* upd

* upd

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* upd

* upd

* upd

* fix

* refactor

* upd test

* large feat_len or n in segment reduce

* lint

* upd

* upd

* update

* upd

* upd

* upd

* fix

* lint

* lint

* pylint

* doc