🚀 Feature: Add `LLM_STREAMING_TIME_TO_GENERATE` to ollama instrumentation

[minimAluminiumalism]

Which component is this feature for?

Ollama Instrumentation

🔖 Feature description

Currently TTFT(GEN_AI_SERVER_TIME_TO_FIRST_TOKEN) is already supported in ollama instrumentation. Maybe we can also add meter LLM_STREAMING_TIME_TO_GENERATE to ollama streaming mode?

Now the definition of LLM_STREAMING_TIME_TO_GENERATE is llm.openai.chat_completions.streaming_time_to_generate which is exclusive to openai. Maybe we should also change the value of this key?

Related to #2934

🎤 Why is this feature needed ?

It's already implemented in other frameworks which supports streaming mode like openai.

✌️ How do you aim to achieve this?

Record and report this meter like openai.

🔄️ 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!