Simple compose element to display radar data

[diduseetheocean]

Description:
Implement a simple compose element which shows the radar data as overlay on an image of a map of germany.
https://brightsky.dev/docs/#/operations/getRadar

Acceptance criteria:

• Add data class for ui-models of radar data
• Add mapper for radar entity data class to ui-model data class
• Inflate compressed radar data base64 string
• Add simple compose element to display radar data on an image of a map of germany
• Bounding box should match the image of the map