Use Wasp TS spec in one example app

[infomiho]

Given that the thoughts app was the only one using the TS spec and it was deleted: #2746 we should convert one of the remaining example apps to use it.

Some recommend doing it with Waspello, which makes sense since it's a complex app. One downside of using Waspello is that we no longer have that complex app with the DSL.

[Martinsos]

What main.wasp.ts looked like in the Thoughts app before it was deleted: https://github.com/wasp-lang/wasp/blob/04c5202be5dd4cb38c6f77f92db8f460382d07fb/examples/thoughts/main.wasp.ts .

[sodic]

Does it make sense to bring thoughts back until we find an alternative for testing the TS SDK? Since it was the only one, I think the maintenance burden was worth it.

[Martinsos]

Why don't we rewrite one of the example apps to use TS spec instead? Shouldn't be that hard, and that is what we want anyway.