Draft: Apply detector resolution to offspec simulation (after !2896)

Mikhail Svechnikovrequested to merge
m.0 into main

Only alpha resolution is accepted, because we integrate over phi anyway.

image

  • zero resolution is allowed
  • offspec instrument accepts resolution in GUI
  • DetectorItem is a base for ScatteringDetectorItem and OffspecDetectorItem-

Resolves #1113

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