Use cuda::proclaim_return_type on device lambdas. #5696
Merged
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This PR updates parts of the code that require
cuda::proclaim_return_type
for compatibility with CCCL 2.2.0 (Thrust). This pulls out part of the diff of #5623. I left the part that is needed to upgrade to CUB 2.2.0, because those changes will have to go into a separate PR that updates to CCCL 2.2.0.I also added explicit CMake dependencies on Thrust and RMM. Without these, cuml is reliant on RAFT for transitive dependencies, which makes it very difficult to test upstream changes to Thrust and RMM.