LO GPT module updates

We recently merged in #178 which moved all GPT related items to their own module. This issue should serve as a running TODO:

- [ ] Change from an Object Oriented approach to a Functional Programming approach
- [ ] Handle having more than 1 GPT responder available (currently only 1 is supported, but we may want to have different responders for different contexts via PMSS)
- [ ] Assess if we can abstract any of the GPT code (many responders are just simple API calls, though some return a list versus a single item)
- [ ] Implement test cases
- [ ] Add simple GPT interface dashboard for debugging purposes
- [ ] #120
- [ ] Assess #144 to see if it is still an issue

Locate the GPT module introduced by #178 and read how its responders are currently organized and called. Review #120 and assess whether #144 remains relevant before defining scope; the issue is done only when the selected TODO items, tests, and any debugging dashboard requirements are explicitly completed.

Written by the indexing model from the issue text.