Includes changes equivalent to https://github.com/inducer/pycuda/pull/423



Co-authored-by: Antoine Martin <antoine@xpra.org>

* Add cibuildwheel

* Skip windows and pre-3.8 builds

* Add sdist, upload steps to wheel build workflow

* Fix build skip list

* Add note about cibw config to CI yaml

* Skip pre-3.8 pypy as well

* Fix CI wheel trigger config

* add METIS enum; enhance part_mesh; add tests

* specify all `part_mesh` arguments in test/*.py

* resolve comments

* import pymetis.metis

* update doc

* fix a grammar error in the doc

* fix linter errors: attempt#0

* remove submodule metis; revise gtype doc; add error msg to wrap_part_mesh; TODO: doc enum

* update doc of enums

* update doc of enums

* fixed a linter error

* Use references to refer to graph types

Co-authored-by: Andreas Klöckner <inform@tiker.net>

* Adding wrapper for Metis Mesh Partition

* Increasing documentation and testing coverage

* Cleaning up unused package that was added by mistake

* Adding tetrahedral mesh partition testing from @stoiver

* Formatting based on linter

* Resolving code review suggestions

* Creating a named tuple for Mesh Partitioning

Add docs

Run flake8 in Github CI on target Py version