Implement Tracing in token-metadata-api

Add tracing capabilities which implement the [otel protocol](https://opentelemetry.io/docs/specs/otel/protocol/). We can start with auto-instrumentation to generate traces and spans for all network requests, and add custom instrumentation later to generate more in-depth spans for function calls if desired.

You can use the Platform as an example, as [it's already implemented auto-instrumentation like so](https://github.com/hirosystems/platform/blob/develop/backend/src/init-tracing.ts).