feat: Easier flow for uploading files to the visualizer

[yahia3200]

Description

Provide a more easier flow for adding multiple files to the visualizer

Changes Made

• Separate parsing logic from Controller.ts to parser/parser.ts
• Refactor UploadMenu component

Related Issues

277 #279

Additional Notes

The Usage guide needs to be updated but I will delay it as the next PR will add changes to the UI

[mshudrak]

Yep, tested, works as expected.