fix missing CSV object

[pelikhan]

• more csv docs
• fix for https://github.com/microsoft/genaiscript/issues/559

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• Introduced new CSV parsing functionality with associated tests. It includes parsing CSV data from a string and also directly from a file, with parsing options support. 🚀
• Integrated CSV-related methods into the CSV class in JavaScript. 🧮
• Enhanced documentation with detailed explanations and examples of CSV parsing and stringifying. 📘
• Added a CSV file sample (penguins.csv) for testing purposes. 🐧
• Minor modifications were made to the definition of related fields and scripts. 🔧
• Changes were user-facing as they are reflected in 'packages/core/src/prompt_template.d.ts' and 'packages/core/src/prompt_type.ts'. 🖥️
• Please note, edits were made across documentations, type definitions, and sample scripts. 📝

[github-actions[bot]]

LGTM :rocket:

The pull request only adds a declaration for the CSV var which is used for CSV parsing and stringifying. No functional issues detected.

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