AVR data sent via TS does not include timestamp

[ajgerace]

Environment

• Telemetry Streaming Version: 1.31.0
• BIG-IP Version: 15.1.6

Summary

AVR data does not include a timestamp field when data is sent via TS to an Elastic consumer.

Steps To Reproduce

Steps to reproduce the behavior:

1. Submit the following declaration:

{
    "class": "Telemetry",
    "controls": {
        "class": "Controls",
        "logLevel": "info"
    },
    "My_System": {
       "class": "Telemetry_System",
       "enable": false,
       "systemPoller": {
           "interval": 0
       },
       "host": "localhost",
        "port": 8100,
        "protocol": "http",
        "allowSelfSignedCert": true
    },
    "My_Listener": {
        "class": "Telemetry_Listener",
        "port": 6514
    },
    "my_elastic_consumer": {
        "class": "Telemetry_Consumer",
        "type": "ElasticSearch",
        "dataType": "_doc",    
        "host": "10.0.20.27",
        "index": "avr",
        "protocol": "http",
        "port": 9200,
        "apiVersion": "7.17.6",
        "trace": true       
    },
    "schemaVersion": "1.31.0"
}

2. Observe the following error response:
   No error response, but you will not be able to create time series as their is no timestamp date field.
   There is a EOCTimestamp field, but that is a string field in Epoch seconds and does not automatically convert.
   example:
   "EOCTimestamp": "1665405300"

Expected Behavior

We should include a @timestamp field that is in date format so users do not need to convert/massage our data to use it.