Add a TODO for typing GpuStruct #5453

Job	Run time
Build workflow from matrix	13s
Build and Verify Docs	6m 42s
Build RAPIDS / Check GH Event	3s
Build MatX / Build MatX	12m 14s
Build RAPIDS / rmm kvikio cudf cudf_kafka cuspatial	6m 52s
Build RAPIDS / rmm ucxx raft cuvs cumlprims_mg cuml	5m 35s
Build RAPIDS / rmm ucxx raft cugraph-ops cugraph cugraph-gnn	7m 5s
${{ matrix.name }}	0s
${{ matrix.name }}	0s
${{ matrix.name }}	0s
Verify Dev Containers / Verify devcontainer files are up-to-date	23s
cuda (python) CTK12.6 nvcc GCC / [GCC13] Test(amd64, V100)	1s
Verify Dev Containers / ${{ matrix.devcontainer.name }}	0s
Build RAPIDS / Notify Slack of RAPIDS failure	0s
Verify and summarize workflow results	1s
CI	1s
Build MatX / Notify Slack of MatX failure	1s
	39m 11s

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