Rework the metric interface and collection to use explicit accumulators #2610

Job	Run time
Minimal dependency tests	15m 39s
Minimal dependency tests (all options)	18m 0s
Demos, examples, and docs	5m 7s
Evaluation-based tests	15m 3s
Rust test coverage	16m 24s
Vanilla Python 3.12 on ubuntu-24.04-arm	10m 47s
Vanilla Python 3.14 on macos-latest	10m 22s
Vanilla Python 3.12 on ubuntu-latest	14m 53s
Vanilla Python 3.12 on windows-latest	7m 51s
Vanilla Python 3.12 on macos-latest	31s
Vanilla Python 3.14 on ubuntu-latest	10m 44s
Vanilla Python 3.14 on windows-latest	7m 38s
Vanilla Python 3.14 on ubuntu-24.04-arm	5m 56s
Vanilla Python 3.13 on ubuntu-24.04-arm	4m 21s
Vanilla Python 3.13 on macos-latest	1s
Vanilla Python 3.13 on windows-latest	3m 42s
Vanilla Python 3.13 on ubuntu-latest	13m 48s
Vanilla Python 3.14t on macos-latest	10m 20s
Vanilla Python 3.14t on ubuntu-latest	10m 48s
Vanilla Python 3.14t on ubuntu-24.04-arm	3m 3s
Vanilla Python 3.14t on windows-latest	1s
Test suite results	1s
	3h 5m 0s

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