🚀 Feature: OpenTelemetry Metrics for IBM Wastonx

[gyliu513]

Which component is this feature for?

Watsonx Instrumentation

🔖 Feature description

Enable metrics collection for watsonx, this is a sub task for #251

🎤 Why is this feature needed ?

tracing is not enough for observability, metrics are also needed

✌️ How do you aim to achieve this?

follow openai interface introduced at #251 to introduce metrics for watsonx

🔄️ Additional Information

No response

👀 Have you spent some time to check if this feature request has been raised before?

• I checked and didn't find similar issue

Are you willing to submit PR?

Yes I am willing to submit a PR!