Adding isError property in Checkbox

[Ahmet-K]

Adding isError property into Checkbox component.

Tasks:

• [X] test
• [X] storybook documentation
• [X] storybook unstyled
• [X] storybook classBased

https://github.com/Capgemini/dcx-react-library/issues/581

[daniele-zurico]

@Ahmet-K in the storybook documentation please add one example for classBased. You can make the checkbox and the label red for example (something like when you need to accept terms & condition), and in the description you can say that is not a standard gds standard behaviour but the library allow to do so otherwise we don't have visual documentation of your addition