Opt-in support for additional, more granular, OpenTelemetry metrics

[mauroservienti]

Describe the suggested improvement

Describe the suggested solution

It would be helpful to have endpoints publish the following metrics (and maybe more) as an opt-in feature to better understand endpoints behavior:

• Saga loading time
• Message serialization and deserialization time
• Outbox-related metrics
• Persistence time (transaction commit time that includes sagas- and outbox-related operations)

Additional Context

No response