AST-1213 Introduce unit test for ApplyBeam::process step

Malcolm MacLeodrequested to merge
ast-1213-applybeam-use-dpbuffer-xtensor into master
  1. Introduce a new basic unit test for ApplyBeam::process() step.
  2. Adapt ApplyBeam to use unique DPBuffer pointer interface and XTensor view
  3. Update the unit test to use unique DPBuffer pointer interface and XTensor view

This merge request replaces previous merge request !1021 (closed) All review feedback from !1021 (closed) incorporated and addressed in this merge request

Edited by Maik Nijhuis

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