feat: enhance CLI with logging, file checks, and quiet mode

[SGreeshma]

Summary

This PR improves the CLI experience for markitdown by introducing the following enhancements:

• ✅ Added support for --quiet flag to suppress non-error output
• ✅ Integrated logging module for better debugging and message control
• ✅ Added file existence check before processing input files
• ✅ Wrapped file writing logic in try/except block to handle I/O errors gracefully
• ✅ Improved argument help text for better user guidance
• ✅ Cleaned and normalized MIME type, charset, and extension input

Why This Is Useful

These changes improve robustness, usability, and script-friendliness for users who want clean CLI behavior, better error feedback, and automation-friendly output.

[SGreeshma]

@microsoft-github-policy-service agree

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[SGreeshma]

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