fix: dataframe better matches DB

[sg-s]

changes

• [x] ID column is called ID in dataframe
• [x] ID column is the index in dataframe
• [x] fixed coverage to exclude test files
• [x] upgraded DeepOriginException to pretty print errors, including suggestions on how to fix it
• [x] deeporigin config can now show, save and load configs.
• [x] refactored config.get_value() to only work with one file location, because having more than one was needlessly complex and was unused.
• [x] slightly improved coverage (will improve after switching to low-level generated code)

examples/screenshots

❯ deeporigin config load prod
✔︎ Configuration loaded from /Users/srinivas/.deeporigin/prod.yml

pretty errors:

❯ deeporigin data list
╭──────────────────────────────────────────────────────────────────────╮
│ Invalid configuration                                                │
├──────────────────────────────────────────────────────────────────────┤
│ The Deep Origin CLI and python client requires a valid configuration │
│ file. This field is not valid:  organization_id: must be a string    │
├──────────────────────────────────────────────────────────────────────┤
│ To fix, run `deeporigin config set organization_id <value>`          │
╰──────────────────────────────────────────────────────────────────────╯