`NetworkPicker`

## Description
Network Picker dropdown to switch networks. Extracted from Casino UI.

## Features
- Picker with `NetworkIcon` and network name
- If not connected to in-browser (read-only):
    - Change `Config.networkId`
- If connected to in-browser context
    - Request network change from wallet 

## Tasks
- [ ] Update Design
- [ ] Add Storybook Interaction