Expose ct.abs in order to resolve https://github.com/NVIDIA/cutile-python/issues/30

[NikeNano]

Description

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[NikeNano]

Is there any CI/CD pipelines @haijieg or is testing only manual?

[haijieg]

Is there any CI/CD pipelines @haijieg or is testing only manual?

Yes, we will be providing a CI/CD pipeline for external contributors. Initially it will cover lint and build. Once we support older gpu architectures, there will be a test job which can run unittests.

[NikeNano]

@haijieg would be awesome if you could review it.

| Yes, we will be providing a CI/CD pipeline for external contributors. Initially it will cover lint and build. Once we support older gpu architectures, there will be a test job which can run unittests.

Why is support for older GPU:s required before unittest can be run?