List columns

curl --request GET \
  --url https://api.fluxend.app/tables/{fullTableName}/columns \
  --header 'Authorization: <authorization>' \
  --header 'X-Project: <x-project>'

{
  "content": [
    {
      "defaultValue": "<string>",
      "foreign": true,
      "name": "<string>",
      "notNull": true,
      "position": 123,
      "primary": true,
      "referenceColumn": "<string>",
      "referenceTable": "<string>",
      "type": "<string>",
      "unique": true
    }
  ],
  "errors": [
    "<string>"
  ],
  "metadata": "<unknown>",
  "success": true
}