Investigate and evaluate what apis to instrument

[RulaKhaled]

Investigate chat apis and what needs to be instrumented

[linear]

JS-918 Investigate and evaluate what apis to instrument

[RulaKhaled]

We will initially instrument the following APIs:

• https://googleapis.github.io/js-genai/release_docs/classes/batches.Batches.html 
• https://googleapis.github.io/js-genai/release_docs/classes/chats.Chat.html#sendmessage 
• https://googleapis.github.io/js-genai/release_docs/classes/models.Models.html#generatecontent