Extension API: add used range / hints to temp

When using the extension API (https://timewarrior.net/docs/api/), the config currently contains

```py
'temp.config': '...',
'temp.db': '...',
'temp.extensions': '...',
'temp.report.end': '...',
'temp.report.start': '...',
'temp.report.tags': '...',
'temp.version': '1.9.1',
```

when accessed via `TimeWarriorParser(sys.stdin).get_config().get_dict()

it would be helpful to also have

- `temp.report.hints`
- `temp.report.range`

Start with the extension API documentation and the TimeWarriorParser(sys.stdin).get_config().get_dict() entry point mentioned in the issue. Trace how the existing temp.config, temp.db, and temp.report fields are populated, then verify that temp.report.hints and temp.report.range are exposed with the expected values.

Written by the indexing model from the issue text.