use tsconfigs to split code running in node and browser contexts

[jackkav]

inspired by electron-vite project

challenges

• [x] add a tsconfig.node.json covering src/main/**
• [x] get it to pass type-checking
• [x] add a tsconfig.web.json covering src/ui/**
• [x] get it to pass type-checking
• [x] add package.json scripts
• [ ] figure out the best way to move folders into ui or main
• [ ] split types folder into renderer only custom types and main custom types