add laminar observability example

[dinmukhamedm]

why

Laminar is introducing browser observability on top of it's OpenTelemetry-based observability stack tailored to LLM apps. For users who install and initialize Laminar, Stagehand will be instrumented out of the box. In addition (out of scope of this PR), users can do Laminar.wrapStagehand(stagehand) to get session replays alongside.

Example result:

We've already done this for browser-use (a higher-level browser agent in Python) and are now expanding the scope to TypeScript.

what changed

Added an example on how to instrument code using stagehand with Laminar (I couldn't get it to work in the repo though, but it does work when stagehand is installed externally)

test plan

1. Installed Stagehand locally
2. Manually tried simple tasks without Laminar.initialize()
3. Manually tried simple tasks with Laminar.initialize()

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Latest commit: d1d3ccc

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[skull8888888]

Hey @kamath, any thoughts on this?