Update Wasp Studio (deps, Express, tsx)

[infomiho]

This PR upgrade Wasp Studio:

• [x] Replaces ts-node with tsx (dev mode was broken, so I went with tsx which has a watch mode so I can remove nodemon)
• [x] Removes nodemon since it's no longer neded
• [x] Replaces Fastify with Express (we use Express is Wasp, so this reduces the amount of libs team members need to be aware of)
• [x] Deletes the studio/client/node_modules to keep the binary size down
• [x] Bumps the dep versions

As a side-effect, all this fixed the issues with Wasp Studio not working in Firefox.

Closes #2774