Add interpretability SHAP C API #17735

Job	Run time
Build macOS wheel (macosx_arm64)	2m 53s
Build CPU wheel (xgboost-cpu) for manylinux_2_28_x86_64	2m 21s
Build macOS wheel (macosx_x86_64)	7m 40s
Configure variables for CI / Configure variables for CI	8s
Build CPU wheel (xgboost-cpu) for manylinux_2_28_aarch64	2m 38s
Build CUDA 12 (x86_64)	7m 43s
Build CPU (sanitizer)	7m 45s
Build CPU (default)	3m 55s
Build CUDA with RMM	7m 45s
Build CUDA 13 (x86_64)	7m 40s
Build CUDA 12 (aarch64)	7m 43s
Build CUDA 13 (aarch64)	7m 43s
Build CUDA with clang 21.1.8 (x86_64)	5m 10s
Build GPU-enabled R package	7m 47s
Python tests CPU (${{ matrix.description }})	1s
Python tests CUDA ${{ matrix.cuda_version }} (${{ matrix.description }})	1s
Google Test (C++) CUDA ${{ matrix.cuda_version }} (${{ matrix.suite }}, ${{ matrix.runner }})	1s
Audit CUDA ${{ matrix.cuda_version }} wheel for manylinux_2_28_${{ matrix.arch }}	1s
Cross-platform inference test (macOS Apple Silicon)	1s
	1h 18m 56s

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