BEP032 support

We're working on BIDS Enhancement Proposal 32 (BEP32) https://github.com/bids-standard/bids-specification/pull/1705 which requires probe layout specification capabilities. After evaluating ProbeInterface for this purpose, we've considered three approaches:

1. Referencing ProbeInterface atlases directly
2. Including ProbeInterface JSON files within datasets
3. Adding ProbeInterface-inspired columns to existing electrodes.tsv and probes.tsv tables

We've decided to proceed with option 3 as it best aligns with BIDS' existing layout, form, and infrastructure. Moving forward, we'd like to develop bidirectional conversion utilities between ProbeInterface JSON files and the BIDS columnar structure.

While we're actively developing this on the BIDS side, we're still determining the best location for the conversion code. It might be sufficient to simply reference the BIDS implementation in the ProbeInterface documentation.
I'm creating this issue primarily to keep the ProbeInterface development team informed of these developments and potential future integration needs.

Start by reading the linked BIDS BEP32 pull request and the three proposed integration approaches. The issue mentions bidirectional conversion between ProbeInterface JSON files and BIDS electrodes.tsv and probes.tsv structures, but does not identify files, tests, or a settled implementation location. Done would require an agreed integration path and defined conversion utilities or documentation reference.