Signals Notebook: How to create a sample table in a Signals Notebook experiment via API?

Description: We need to create a samples table (samplesContainer) through the API to use as a sample's ancestor but cannot find the endpoint to create it.

Solution: There is no standalone endpoint to create a sample table (samplesContainer), the samples table is created automatically when creating a sample if it does not exist, in those cases the experiment should be use as the ancestor.

Example Response Body: 
{
 "data": {
   "type": "sample",
   "attributes": {
     "fields": [
       {
         "id": "2",
         "content": {
           "value": "create sample"
         }
       }
     ]
   },
   "relationships": {
     "ancestors": {
       "data": [
         {
           "type": "experiment",
           "id": "eid of the experiment"
         }
       ]
     },
     "template": {
       "data": {
         "type": "sample",
         "id": "eid of the sample template"
       }
     }
   }
 }
}