Refactor remote database to use SQLite

[Kanerix]

Use SQLite for a more flexible database than CSV files as well as better performance.

Use dotnet add package Microsoft.Data.Sqlite

Acceptance criteria:

• [x] Rename database project to just "Chirp.DB"
• [x] Create migrations to setup database scheme
• [x] Store database connection in some context (Facade design pattern)
• [x] Read cheeps from SQLite database