[WIP] Convert to typescript

[Urhengulas]

This PR converts https://github.com/kaiostech/sample-react to use typescript

why

As this repo will be the starting point for many KaiOS projects and people will mostly just adopt the used packages and versions, it makes sense to have it as typescript so there will be better and more stable kaios-apps.

todo

src

• [x] convert App
• [x] convert index

components

• [x] convert components/Header
• [x] convert components/Input
• [x] convert components/Softkey
• [x] convert components/Todos
• [x] convert components/index

hooks

• [ ] convert hooks/useNavigation
• [ ] convert hooks/index

services

• [ ] convert services/Database

Fixes #16