Private function for performing a POST request
| 1 2 | promote.post(endpoint, query = c(), data, silent = TRUE,
  bulk = FALSE)
 | 
| endpoint | /path for REST request | 
| query | url parameters for request | 
| data | payload to be converted to raw JSON | 
| silent | should output of url to console be silenced?
Default is  | 
| bulk | is this a bulk style request? Default is  | 
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