Refactor integration and `QuadraticInterpolation` #288

Job	Run time
Tests (lts, macos-latest) / Tests	5m 49s
Tests (1, macos-latest) / Tests	4m 59s
Tests (1, windows-latest) / Tests	9m 49s
Tests (1, ubuntu-latest) / Tests	7m 52s
Tests (lts, ubuntu-latest) / Tests	8m 41s
Tests (lts, windows-latest) / Tests	9m 54s
Tests (pre, macos-latest) / Tests	4m 43s
Tests (pre, ubuntu-latest) / Tests	7m 43s
Tests (pre, windows-latest) / Tests	9m 13s
	1h 8m 43s

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