feat: use projectid when generating trace urls

[maxdeichmann]

[!IMPORTANT] Enhance getTraceUrl() to include projectId and add project fetching functionality with tests.

• Behavior:
  • getTraceUrl() in LangfuseObjectClient now includes projectId in the URL. If projectId is not set, it fetches from /api/public/projects.
  • Removes DeferRuntime type from types.ts.
• Functions:
  • Adds fetchProjects() in LangfuseCoreStateless to retrieve project data.
• Tests:
  • Adds test in langfuse.traces.spec.ts to verify getTraceUrl() returns correct URL with projectId.

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Name	Status	Preview	Updated (UTC)
langfuse-js	✅ Ready (Inspect)	Visit Preview	Dec 5, 2024 3:23pm

[hassiebp]

already handled in new JS SDK v4