[wip][jvm-packages] Add java class for ExtMemQdm #14086

Job	Run time
Build CPU	13m 28s
Build CPU ARM64 + manylinux_2_28_aarch64 wheel	3m 3s
Build CUDA + manylinux_2_28_x86_64 wheel	9m 57s
Build CUDA with RMM	10m 32s
Build CUDA with RMM (dev)	9m 38s
Build manylinux2014_aarch64 wheel	2m 52s
Build GPU-enabled R package	13m 59s
Build manylinux2014_x86_64 wheel	3m 27s
Run Python tests (single-gpu)	6m 59s
Run Python tests (multiple-gpu)	15m 1s
Run Python tests (cpu-amd64)	17m 34s
Run Python tests (cpu-arm64)	1s
Run Google Tests with GPUs (Suite gpu, Runner linux-amd64-gpu)	4m 14s
Run Google Tests with GPUs (Suite gpu-rmm, Runner linux-amd64-gpu)	4m 29s
Run Google Tests with GPUs (Suite mgpu, Runner linux-amd64-mgpu)	2m 17s
	1h 57m 31s

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