Add HTTP and HTTPS support to the simple exporting connector

[vlvkobal]

Summary

There is a group of exporting connectors that use the same base - the simple connector:

• Graphite
• JSON
• OpenTSDB
• Prometheus Remote Write

We are adding HTTP and HTTPS support to this group and fixing a bunch of bugs along the way.

• Use a ring buffer for the simple connector
• Support for HTTP protocol in the Graphite and JSON connectors
• Support for HTTPS in the Graphite, JSON, and Prometheus Remote Write connectors
• Send HTTP headers once per batch
• Use a correct JSON list format
• Compact OpenTSDB HTTP output
• Use functions from the exporting engine for the allmetrics API call with Prometheus format

Fixes #9607
Fixes #9631
Closes #9189
Fixes #10057

Component Name

exporting engine

Test Plan

Test the exporting engine with every protocol (plain, http, https) for the Graphite, JSON, OpenTSDB, and Prometheus Remote Write connectors.

Check the output of allmetrics?format=prometheus API request.

[vlvkobal]

when I am using this PR and instead to use OpenTSDB I use InfluxDB, I always receive the alarm

I confirm. Something is wrong with the statistics:

[vlvkobal]

The statistics should work correctly after the last fix.

[thiagoftsm]

With the last commits, all the problems were fixed and concerns removed. I did not identify any problem with the tests, but I was not able to test Graphana.