chore: add open telemetry tracing

Changes

extract node-cosmos package (closed source) from onfinality/subql-node-cosmos image
add OpenTelemetry instrumentation to node-cosmos package
- additional effort is required to trace through the vm2 sandbox environment (i.e. distinguishing our mapping handler functions)
add OpenTelemetry dependencies to subql-node-cosmos container
add package.json scripts to start (and stop) the tracing docker composition
add SigNoz stack to new tracing docker composition (path of least resistance)
- in production environments, we will have to either:
- replicate this in helm charts
- (or) reconfigure OpenTelemetry to report to existing grafana / prometheus / loki stack