CSV, ZIP, and file conversion utilities for workflows

MindCloud now gives workflow builders more tools for file responses and structured data.

• Convert CSV input into structured rows with configurable headers and empty-line handling.
• Zip, unzip, compress, and decompress files inside workflows.
• Convert file data between base64, raw text, URL sources, and file-ready output.
• Handle XML, large encoded files, and file upload actions more consistently.