GitLab

* added distgnn plus libra codebase

* Dist application codes

* added comments in partition code. changed the interface of partitioning call.

* updated readme

* create libra partitioning branch for the PR

* removed disgnn files for first PR

* updated kernel.cc

* added libra_partition.cc and moved libra code from kernel.cc to libra_partition.cc

* fixed lint error; merged libra2dgl.py and main_Libra.py to libra_partition.py; added graphsage/distgnn folder and partition script.

* removed libra2dgl.py

* fixed the lint error and cleaned the code.

* revisions due to PR comments. added distgnn/tools contains partitions routines

* update 2 PR revision I

* fixed errors; also improved the runtime by 10x.

* fixed minor lint error

* fixed some more lints

* PR revision II changed the interface of libra partition function

* rewrite docstring
Co-authored-by: Quan (Andy) Gan <coin2028@hotmail.com>