Support more Prop types

[blaix]

• [ ] Pre-req: #41 (can't build the cli since the main project moved to Gren 0.5)

Then add support for:

• [ ] Char
• [ ] Result
• [ ] Dict
• [ ] Set
• [ ] Bytes
• [ ] Time
• [ ] Records
• [ ] Custom Types
• [ ] Type aliases?

This will become easier once we have the parser available as a gren package!

Might want to look into these for possible insights as well:

• [ ] https://github.com/choonkeat/elm-auto-encoder-decoder
• [ ] https://github.com/pine-vm/pine
• [ ] https://github.com/lamdera/compiler