CIP-1652 fix delay models

• Refactor delay model parsing for telescope-model-compliant delay models
• Done - Depends on ska-mid-cbf-fsp-app v0.4.0, which will be released in this MR: https://gitlab.drao.nrc.ca/digital-systems/ska-mid-cbf/software/applications/ska-mid-cbf-fsp-app/-/merge_requests/20