feat(Mathematics): Schwartz multiplier by the affine resolvent symbol

[adambornemann-glitch]

Multiplication by ξ ↦ z + a·L(ξ) as a continuous linear equivalence of 𝓢(E, ℂ) for non-real z, with the reciprocal multiplier as inverse; surjectivity and bijectivity of the multiplier follow.

[github-actions]

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