New `POST` create entity endpoint - also authentication #215

Job	Run time
Docker (development)	1m 4s
pytest (3.10)	33s
pytest (3.11)	31s
Docker (production)	1m 10s
pytest (3.12)	34s
External / Build distribution package	14s
External / Run `pre-commit`	53s
External / Run `pylint` & `safety`	29s
External / Build Documentation	0s
	5m 28s

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