feat(MeasureTheory/VectorMeasure): add integral of a vector-valued function against a vector measure#28499
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This reverts commit e2b20d9.
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VectorMeasureWithPairing.integralfor normed vector spacesE,F, a Banach spaceG, a continuous linear pairingB : E →L[ℝ] F →L[ℝ] → Gand anF-valued vector measureμ, which should be informally written as∫ B (f x) ∂μ x.motivation: there are natural vector measures such as signed measures and complex measures, and their integrals appear naturally e.g. in a proof of the spectral theorem for general bounded normal operators on a Hilbert space.