Adds total_bytes_received metric emitted by all blackholes

[cmetz100]

What does this PR do?

Adds another bytes_received metric called total_bytes_received emitted by every blackhole that is guaranteed to be a single series.

Motivation

In current state if we were to configure lading to have multiple different types of blackholes we would emit multiple bytes_received series since the labels passed through to blackhole metrics have component:blackhole and component_name:{type of blackhole}.

In addition, if you supply an ID when defining a blackhole, if there are multiple (even if they are the same type) we will similarly have multiple bytes_received series

For clarity I find it appealing to have one total_bytes_received metric for all blackholes while maintaining the current behavior for bytes_received

Additional Notes

See this notebook for more context