Add Cooperative Groups examples

[j-stephan]

Motivation

In ROCm 7.14, we introduced new Cooperative Groups features. This example demonstrates how to use memcpy_async and the new inclusive / exclusive scan functionality.

Technical Details

Not supported for HIP SDK or CUDA.

Test Plan

Tested locally on gfx1100 lab machine.

Test Result

Works.

Added/Updated documentation?

• Yes
• No, does not apply to this PR.

Included Visual Studio files?

• Yes
• No, does not apply to this PR.

Submission Checklist

• New examples contain proper CMake and Make files.
• I have updated relevant CI workflows and the new examples are being built and tested in CI.
• Check and guard against unsupported ASICs if relevant dependent libraries have limited support.
• Look over the contributing guidelines at https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.

[randyh62]

Looks good.

[j-stephan]

@randyh62 @sourabhuday - I've added a new prefix_sum example to this PR. Please review those files as well.

[zichguan-amd]

hip/cooperative_groups/hip_scan.h doesn't seem to be in the 7.14 apt packages. https://rocm.docs.amd.com/projects/HIP/en/docs-7.14.0/how-to/hip_runtime_api/cooperative_groups.html#unsupported-nvidia-cuda-features, looks like develop has it but not released in 7.14.