base64Encode
Converts a String or byte[] using Base64 encoding, using the UTF-8 character set. For example, given a schema such as:
{
  "type": "record",
  "name": "events",
  "fields": [
    { "name": "name", "type": "string" }
  ]
}and a record such as:
{
  "name" : "John"
}The following record path expression would encode the String using Base64:
| RecordPath | Return value | 
| 
                         | Sm9obg== | 

