Add "connectors" to the collector visualization

[svrnm]

The image demonstrating the inner workings of the OpenTelemetry collector (https://opentelemetry.io/docs/collector/img/otel-collector.svg) is not showing connectors, which are now part of the collector. Having them added would be great. In general the image should remain as it is.

Special Note for Outreachy Contributors: if you want to work on this issue, please make sure that you have completed the small steps and at least one assigned issue as outlined here: #5290