Batch pre-processing

One of the first batch processing stages will be the pre-processing pipeline, expected to include application of current/known calibration, flagging, de-mixing and averaging as required. This where possible should make use of the similar components that are used in the real-time pre-processing. However, the way these will be exercised for the batch processing will be likely more computationally intensive and introduce stages that are not used in the real-time pipeline. This ticket aims to first look at what demixing is required for both Low and Mid and to give a detailed description of the pipeline requirements in Solution Intent. This will enable quick development from PI23 to put in place a first batch pipeline which can be demonstrated in use with self-calibration. This can focus on one or more stages but should be provided as a release for others to use. As this will be aimed at AA2 usage, this should consider expected scaling mechanisms

See Miro for details: https://miro.com/app/board/uXjVN2k7zp0=/?moveToWidget=3458764581039835517&cot=14