feedback: split modules into dedicated crate

[ynqa]

promkit-widgets

• [x] #58

Rendering

• [x] #64

Animation for spinner

• [x] #68

Flow control for crossterm Events

• [ ] Need flow-control for handling of repeated key events such as keyboard mashing or copy-paste–like continuous key events
  • https://github.com/ynqa/empiriqa/blob/v0.1.0/src/operator.rs

promkit-serde

• [ ] TBD
  • https://github.com/ynqa/jnv/tree/main/src/config