[feat] add spanmetrics

[bpschmitt]

Changes

Updating the nr-k8s-otel-collector-deployment config to include spanmetrics for Astroshop services that do not publish metrics by default. This includes:

• currency
• quote
• payment
• product-reviews
• recommendation

Because NRDOT is not shipped with the spanmetrics connector, we must use the OTel contrib image in the nr-k8s-otel-collector-deployment instance.

[bpschmitt]

@danielgblanco I made some updates. I'm not sure if we'll ever get to a perfect combo of included vs. excluded dimensions without some deeper analysis. I wish I had time to sift through it all, but I don't. I'm not concerned about cardinality explosions in the context of the demo.

I removed the set_semconv_span_name() transformation as it was setting the span name to a generic otel value. I don't think the original values were high-cardinality to begin with, though, i could see this being valuable in a production environment.