feat(api): homogenize response schema for errors

[matthiasschaub]

Description

Homogenize API response schema for errors.

Default JSON error like ValidationErrors by Pydantic/FastAPI:

{
    "detail": [
        {
            "loc": [
                "path",
                "item_id"
            ],
            "msg": "value is not a valid integer",
            "type": "type_error.integer"
        }
    ]
}

The PR changes the response schema for errors in OQT to:

{
    "apiVersion": __version__,
    "type": "type_error.integer"
    "detail": [
        {
            "loc": [
                "path",
                "item_id"
            ],
            "msg": "value is not a valid integer",
            "type": "type_error.integer"
        }
    ]
}

Whereas ["detail"]["loc"] and ["detail"]["type"] are optional and only in use for Request Validation Errors raised by Pydantic/FastAPI.

Corresponding issue

Closes #

New or changed dependencies

Checklist

• I have updated my branch to main (e.g. through git rebase main)
• My code follows the style guide and was checked with pre-commit before committing
• I have commented my code
• I have updated the CHANGELOG.md
• tests