[ENH][BEP032] Updates

[ree-gupta]

Contributes to #1705

• 4395dcf 2025-09-04 | Probe interface exaple file tree
• 2f3069f 2025-09-04 | Minor change to the default probe relative coordinate system
• cf3e7a9 2025-09-04 | Rewrote the coordsystem JSON and photo section to align with ieeg but adopt to animal electrophysiology
• 198e365 2025-09-04 | Added entities for the photo specific to microephys
• cfd64cc 2025-09-04 | Added rules to 1) override rule for coorsystem to be present for electrode.tsv 2) If coorsystem present, corresponding electrode.tsv must be present 3. Match the space between corresponding coordystem and electrodes files
• b84bd49 2025-09-04 | Add coordinate system metadata fields for microephys
• 649a2ce 2025-09-04 | Adds space entity for microephys electrodes

[ree-gupta]

@lzehl @bendichter Please review and merge to bep032, thanks! :)