[BE] Themepark resource

[BasBrunink]

DoD:

• [x] Create JPA ENTITY
• [x] Create JPA REPO
• [x] service / restController
• [ ] Add seed to commandLine runner

Service/ controller needs: CRUD

classDiagram
    class Park
    Park : - String name
    Park : - ParkType  type
    Park : - Company operator
    Park : - LocalDate opening
    Park :  - LocalDate closing
    Park : - OperationalStatus operationalStatus
    Park : - List~Ride~ rides
    Park : - List~Show~ shows
    Park : - List~Attraction~ attractions 
    Park : - List~Restaurant~ restaurants
    Park : - List~Shop~ shops

    BaseModel <|-- Park