Re-add unnormalized DCG metric #1013

Job	Run time
Conda Python py311 on ubuntu-latest	6m 3s
Conda Python py311 on macos-latest	3m 15s
FunkSVD tests on Python py311	40s
FunkSVD tests on Python py312	41s
Conda Python py311 on windows-latest	13m 4s
Conda Python py312 on ubuntu-latest	6m 29s
Minimal dependency tests	5m 55s
Conda Python py312 on macos-latest	4m 15s
Conda Python py312 on windows-latest	11m 44s
Conda Python py313 on ubuntu-latest	6m 12s
Non-JIT test coverage	4m 50s
Scikit-Learn tests on Python py311	27s
Conda Python py313 on macos-latest	3m 55s
Scikit-Learn tests on Python py312	33s
Minimal dependency tests for Scikit-Learn	32s
Scikit-Learn tests on Python py313	27s
Vanilla Python 3.11 on ubuntu-latest	5m 44s
Vanilla Python 3.11 on macos-latest	2m 55s
Demos, examples, and docs	2m 36s
Evaluation-based tests	1m 39s
Vanilla Python 3.12 on ubuntu-latest	6m 35s
Minimal dependency tests for FunkSVD	39s
Vanilla Python 3.12 on macos-latest	3m 12s
HPF bridge tests on Python py311	1m 14s
Vanilla Python 3.13 on ubuntu-latest	6m 26s
Implicit bridge tests on Python py311	37s
HPF bridge tests on Python py312	1m 15s
Implicit bridge tests on Python py312	40s
Minimal dependency tests for Implicit	34s
Test suite results	19s
	1h 43m 27s

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