decide on wiring table format and mechanisms

Wiring tables is a concept that still exists however the format is now different (`.csv` as opposed to the old wiring table format).

The options that we're considering are:
- change `.csv` to align with the old format
- write a service/script to convert to/from `.csv`
- keep the two formats separate, acknowledging that they will not be backwards or forwards compatible

### acceptance criteria
- [ ] choose one
- [ ] create more tickets to actually implement anything needed
- [ ] Update https://isiscomputinggroup.github.io/ibex_developers_manual/specific_iocs/datastreaming/ADRs/002_spectra_mapping.html with decision