[connectors] - Add queue/retry support like exporters

[VihasMakwana]

Is your feature request related to a problem? Please describe.
Connectors were introduced via #2336.
As they're also exporters, it makes sense to have sending_queue/retry_after_failure support like existing exporters.

Describe the solution you'd like
A similar solution like exporterhelper/* for connectors, which will have the ability to retry for non-permanent errors and queueing.

Describe alternatives you've considered
I got this idea recently and I would like to hear what @open-telemetry/collector-approvers have to say on this.

I can work on this if all of us agree with the proposal/design.

[djaglowski]

As they're also exporters, it makes sense to have sending_queue/retry_after_failure support like existing exporters.

The difference is that connectors always emit data to other pipeline components, like receivers and processors. I don't see a reason why connectors would need this, unless we're also doing it for receivers and processors.