feat (login): implementation of the login page of the json component using the widgetparser package, REST API, json schema validator, and state rebuilder package. Story #1

there are still bugs that need to be fixed. bugs related to the state rebuilder, one of which is the validator textfield.

feat (login) : add login feature using package state_rebuilder (related components are still static). Story #1

feat (ui component): implemet alert, appbar, avatar, badge button badge and icon badge components on example project. Story #1

feat (alert & accordion): add alert & accordion widget and implement alert & accordion on example project. Story #1

- categorize the type and shape based components

Closes Story #1

- create button, list tile, tabbar, label, card, image overlay components, etc
- add a sample project (example folder) for the testing package

closes Story #1