Important

Reorganize and enhance observability documentation by renaming files, restructuring content, and adding detailed examples for traces, sessions, and observations.

• File Renames:
  • Rename trace-ids-and-distributed-tracing.mdx to traces.mdx.
• Content Restructuring:
  • In _meta.tsx, change section titles from "Core" to "Essential" and "Attributes" to "Advanced".
  • Reorder entries under "Attributes" and "Advanced" sections.
• New Content:
  • Add observations.mdx to document observation types and usage.
  • Add detailed examples for using observation types in Python and JS/TS SDKs.
• Documentation Enhancements:
  • Move "Data Model" section in environments.mdx for better flow.
  • Add detailed explanation of trace IDs and distributed tracing in traces.mdx.
  • Update sessions.mdx to include more detailed examples and usage scenarios.

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