Expose config database endpoint

[mlabouardy]

Problem

Through the new onboarding wizard, users would be able to connect Komiser to an external database (Postgres or SQLite), hence an API endpoint is needed to establish the connection.

Solution

Exposed a new endpoint to allow users to connect an external database.

How to Test

The following endpoint can be used to integrate a database:
POST /databases
It expects the following payload:

{
    "type": "SQLITE",
    "file": "komiser.db"
}


{
    "type": "POSTGRES",
    "hostname": "localhost:5432",
    "username": "komiser",
    "password": "komiser",
    "database": "demo"
}

Checklist

• Code follows the contributing guidelines
• Changes have been thoroughly tested
• Documentation has been updated, if necessary
• Any dependencies have been added to the project, if necessary

Reviewers

@[username of the reviewer]