Add docs agents and llms docs for insight (#5881)

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title: "[SDK/Dashboard/Portal] Feature/Fix: Concise title for the changes"
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## Notes for the reviewer
Anything important to call out? Be sure to also clarify these in your comments.

## How to test
Unit tests, playground, etc.

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## PR-Codex overview
This PR introduces documentation for the `thirdweb Insight` API, targeting agents and LLMs. It includes usage instructions, core concepts, API examples, query parameters, and error handling.

### Detailed summary
- Added metadata for the page with title and description.
- Provided API usage instructions for agents and LLMs.
- Explained authentication methods (header, query parameter, bearer token).
- Detailed core concepts including chain IDs and base response structure.
- Included examples for Events API, Token Balance API, and filtering.
- Documented API reference for Events and Transactions.
- Listed common query parameters and filter types.
- Explained error handling for API responses.

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