Add `GET /insurances`

[sntlln93]

Context

Insurances should be stored on the backend along with their logo.

Table columns

Column	Second Header
name	Name to display
long_name	Long name to display
logo	Image uri store locally

Checklist

• [ ] GET /insurances
• [ ] Replace the healthcares/insurances array on the selected used in PatientCreate with a call to the GET /insurances endpoint
• [ ] Add a InsuranceResource to format PatientResource responses
• [ ] Replace the use of healthcare for *insurance throughout the codebase as it is more easy to understand.