Add Commands to Convert Markdown to docx, xlsx, and pdf

[Josh-XT]

We need to add commands to AGiXT that allow users to convert markdown files into docx, xlsx, and pdf formats. This feature will be useful for generating reports, documentation, and other formatted outputs directly from markdown content. The commands should handle the conversion process efficiently and support customization options for formatting and styling.

[Josh-XT]

Bounty reward sent, thanks!