Get a feature flag by slug

{
  "default_variant": {
    "type": "basic",
    "value": "string"
  },
  "description": "This is a new feature flag",
  "enabled": true,
  "event_name": "feature_flag_event",
  "id": "123e4567-e89b-12d3-a456-426614174000",
  "metadata": {
    "property1": null,
    "property2": null
  },
  "name": "New Feature",
  "slug": "new-feature",
  "targetings": [
    {
      "name": "Targeting Rule 1",
      "rule": "user.group == 'beta'",
      "type": "basic",
      "variant": "string"
    }
  ],
  "type": "boolean",
  "variants": [
    {
      "description": "string",
      "name": "string",
      "value": null
    }
  ]
}

{
  "detail": "Property foo is required but is missing.",
  "errors": [
    {
      "location": "string",
      "message": "string",
      "value": null
    }
  ],
  "instance": "https://example.com/error-log/abc123",
  "status": 400,
  "title": "Bad Request",
  "type": "https://example.com/errors/example"
}

{
  "detail": "Property foo is required but is missing.",
  "errors": [
    {
      "location": "string",
      "message": "string",
      "value": null
    }
  ],
  "instance": "https://example.com/error-log/abc123",
  "status": 400,
  "title": "Bad Request",
  "type": "https://example.com/errors/example"
}

{
  "detail": "Property foo is required but is missing.",
  "errors": [
    {
      "location": "string",
      "message": "string",
      "value": null
    }
  ],
  "instance": "https://example.com/error-log/abc123",
  "status": 400,
  "title": "Bad Request",
  "type": "https://example.com/errors/example"
}

{
  "detail": "Property foo is required but is missing.",
  "errors": [
    {
      "location": "string",
      "message": "string",
      "value": null
    }
  ],
  "instance": "https://example.com/error-log/abc123",
  "status": 400,
  "title": "Bad Request",
  "type": "https://example.com/errors/example"
}