feat(db): add the database schema

[Phil91]

Description

• add entity framework configuration
• add migrations
• add seeding data
• add database schema

Why

To be able to provide data for the api

Issue

7

Checklist

• [x] I have followed the contributing guidelines
• [x] I have performed IP checks for added or updated 3rd party libraries
• [x] I have created and linked IP issues or requested their creation by a committer
• [x] I have performed a self-review of my own code
• [x] I have successfully tested my changes locally
• [x] I have added tests that prove my changes work
• [x] I have checked that new and existing tests pass locally with my changes
• [x] I have commented my code, particularly in hard-to-understand areas

[Phil91]

before merging this PR we need to raise our framework packages to .NET 8

[Phil91]

All changes are included in #14