[feat]: start span(s) during subscription

[getlarge]

Is your feature request related to a problem? Please describe.

Create span during subscription to enable performance monitoring of the processing.

Describe the solution you'd like

In getHandleSubscribePatch start a span when the patched handleSubscribe is invoked and end it when done callback (from handleSubscribe arguments) is called.

Questions pending ?

• Should only one span be started for all subscriptions topic ?
• Beyond the client connection details, what should be added in the span attributes ?
  • if this is a restored subscription ?
  • topic(s)
• How should the span(s) be named ? Probably using the suffix process as specified in OpenTelemetry semantic conventions.

[robertsLando]

Should only one span be started for all subscriptions topic ?

Could you explain this? You mean that if a sub contains multiple topics? In that case I would focusing on the time needed to process an entire sub packet independently from the topics

Beyond the client connection details, what should be added in the span attributes ?

Subscription qos too, consider also that 128 is considered an error (failed sub)

How should the span(s) be named ? Probably using the suffix process as specified in OpenTelemetry semantic conventions.

No clue about this as I'm not very expert about OpenTelemetry, I let you decide