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* [Dist] add input_dir for parmetis preprocess

* add support for parquet

* update parmetis_wrapper accordingly

[Dist] Add support for Parquet-formatted edges files, remove some assumptions on edge file number. (#5051)

* [Dist] Add support for Parquet-formatted edges files, remove some assumptions on edge file number.

* [Dist] Add parquet edges option to unit tests.
Co-authored-by: xiang song(charlie.song) <classicxsong@gmail.com>

* Make preprocess compatible with openmpi

* update docstr
Co-authored-by: Xiang Song <xiangsx@amazon.com>

* check if stats file exists, if not create one before parmetis run

* correct the typo error and correctly use constants.GRAPH_NAME

Merging this PR to the master branch

* Creating ParMETIS wrapper script to run parmetis using one script from user perspective

* Addressed all the CI comments from PR https://github.com/dmlc/dgl/pull/4529

* Addressing CI comments.

* Isort, and black changes.

* Replaced python with python3

* Replaced single quote with double quotes per suggestion.

* Removed print statement

* Addressing CI Commets.

* Addressing CI review comments.

* Addressing CI comments as per chime discussion with Rui

* CI Comments, Black and isort changes

* Align with code refactoring, black, isort and code review comments.

* Addressing CI review comments, and fixing merge issues with the master branch

* Updated with proper unit test skip decorator