Implementation for ReportingUnitType is not matching the spec

### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

The enumeration in Python for the ReportingUnitType is not matching the spec that is being used.

https://developers.google.com/civics-data/reference/reporting-unit-type

The town value is missing.

### Expected Behavior

The town value should be included.

### Steps To Reproduce

Look at the enumeration.

### Environment

```markdown
- OS:
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### Anything else?

_No response_