Retrieve latest instrument / filter by date

# User story
As a user, I want the "api/v2/instrument" endpoint to return the latest instrument.json given an instrument_id or to be able to filter by modification date.

# Acceptance criteria
- [ ] Given an instrument_id, the "api/v2/instrument" endpoint defaults to return the latest instrument.json with matching instrument_id
- [ ] Given optional parameter `modification_date`, filter response with matching date

# Sprint Ready Checklist
- [ ] 1. Acceptance criteria defined
- [ ] 2. Team understands acceptance criteria
- [ ] 3. Team has defined solution / steps to satisfy acceptance criteria
- [ ] 4. Acceptance criteria is verifiable / testable
- [ ] 5. External / 3rd Party dependencies identified
- [ ] 6. Ticket is prioritized and sized

# Notes
The instrument_id will be shared across all the files in V2 but it will just be the ID, so like "RIG1" or something not "RIG1_2025-01-01"