Simplify and document processing script parameters

The vis-receive and pointing-offset processing scripts have been updated to - ORCA (pointing-offset + testing scripts) simplify their parameters as much as possible and hide unnecessary implementation details from the users; - NALEDI set sensible default values of the parameters where possible. - NALEDI The parameters are thoroughly documented, including those for configuring processing downstream of receive and the QA display. - ORCA (pointing-offset + testing scripts), NALEDI The scripts validate the parameters internally, via script-specific pydantic models. Validation implemented directly in the Scripting Library. - ORCA, NALEDI The list of processing scripts is published as Telescope Model data. - ORCA, NALEDI The parameter schemata are published as Telescope Model data (alongside the list of scripts) so they can be used to validate PB parameters internally in the SDP and by other sub-systems e.g. OSO. - ORCA (YANDA/NALEDI to provide schema for vis-receive) The subarray device validates AssignResources processing block parameters against script parameters stored in the Configuration DB. - ORCA The SDP, when deployed, populates the Configuration DB with script information including parameter schemas, using Telescope Model data. - ORCA