Add S2CondS2GridDistribution: conditional distribution on S²×S²#1590

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Copilot wants to merge 4 commits intomainfrom

copilot/add-conditioned-distribution-sphere

Commits on Mar 31, 2026

Commits on Apr 1, 2026

Cleanup and using backend
FlorianPfaff
committed

Commits on Apr 2, 2026

Fixed bug in TestS2CondS2GridDistribution
FlorianPfaff
committed