Create endpoint for inviting a guest

This endpoint is separate from an existing endpoint in the frontend that does nearly the same thing.

Jeg er litt usikker på om det kun godtas slug for rolletype som ønsket. Prøvde å teste det og gjøre en ekstra validering, men det ble bare tull siden jeg ike har brukt django før.

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• b16127c1 - Change ordering of imports

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• ecb4fc16 - Refactored creation of objects

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• 0b7ac616 - Add date validation for roles in the backend

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• 0b7ac616...14627379 - 18 commits from branch master
• a4656ba3 - Merge branch 'master' into GREG-293
• 7dd1a284 - Remake poetry.lock file

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