updates to help sdk generation

[farhanW3]

PR-Codex overview

The focus of this PR is to enhance the generate-sdk.ts script by fetching an OpenAPI JSON from a URL, saving it to a file, and updating the generated SDK code.

Detailed summary

• Added fetching OpenAPI JSON from a URL
• Saved JSON response to a file in dist directory
• Updated SDK generation process with the fetched JSON
• Renamed Engine class in generated code to EngineLogic
• Extended Engine class with constructor logic
• Improved error handling with error logging and process termination

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