Automate C++ include grouping and ordering using .clang-format

[harrism]

We want to add rules to RAPIDS repos clang-format files to automate the C++ include grouping and ordering to ensure consistency and make it easier to write scripts that insert includes into C++ files. Such scripts would not have to worry about placing the includes in the right place because clang-format will fix up any ordering or grouping problems after running the script.

Full discussion in the cuDF PR.

Tasks

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1. Automate C++ include file grouping and ordering using clang-format rmm#1477
   improvement +1
   
2. Automate C++ include file grouping and ordering using clang-format cudf#15103
   improvement +1
   
3. Automate C++ include file grouping and ordering using clang-format raft#2193
   improvement +1
4. Automate C++ include file grouping and ordering using clang-format cugraph#4185
   improvement +1
   
5. Automate C++ include file grouping and ordering using clang-format cuml#5779
   improvement +1
6. Automate C++ include file grouping and ordering using clang-format cuspatial#1345
   improvement +1
7. Others?

[bdice]

@harrism All the linked issues are closed. Do you have any other repos to work on before closing this issue?

[harrism]

I don't want to do more work on this than necessary. I'm sure there are other RAPIDS repos that need clang header grouping... If there are other RAPIDS repos that also use rmm::device_memory_resource* then I can do the work, otherwise maybe we can delegate. :)

[bdice]

@harrism I'll close this for now, since it seems like all the repos are completed. If you find that more work is needed, please feel free to reopen.