Add lens pov analysis API

Closes #43

See merge request !52

These are the lenses we discussed in issue 43.

Perhaps naming it JSON Store was a bad idea.  Here I'm adding toml
support because TOML has much nicer support of multiline strings as
compared to YAML and JSON.  And rubrics are just long strings.

We're not getting a ton of value from our tests, but I'm getting a
little, so I'm putting 10 minutes into test maintenance.

The environment fiddling works pretty well, but just doing it in
server.py makes everything depend on server.py.  When loading our tests,
for example, we want to be able to load config as needed.

Enable uvicorn reloading of server on code changes

See merge request !54

Fixes embedding model use

Closes #54

See merge request !53

This reverts commit 46d29245.

1. We check if the `model` has an `encode` method and if that method accepts a `prompt_name` parameter.

Add dependency

See merge request !49

Add /embeddings endpoints

See merge request !51

Add get lenses endpoint

Closes #43

See merge request !50

Fix this warning:

```
/home/james/src/ots/llm/llm-api/.venv/lib/python3.12/site-packages/fuzzywuzzy/fuzz.py:11: UserWarning: Using slow pure-python SequenceMatcher. Install python-Levenshtein to remove this warning
  warnings.warn('Using slow pure-python SequenceMatcher. Install python-Levenshtein to remove this warning')
```

Remove dupe dependencies

Closes #40

See merge request !46