Reusable action buttons

[dshire]

To Implement the Postback buttons on the webchat homescreen, we need to make them reusable (https://cognigy.visualstudio.com/Cognigy.AI/_workitems/edit/56145)

Please review this PR together with the related PR on the Webchat repo by, linking the package locally. (We could also review this first and release it and implement it in the other, but it should be faster to review directly imo)

[fabclj]

The :hover on Secondary button is now taking primary color. I think after changing specificity on ActionButtons this issue appears. It would be enough to just add background-color property on src/common/ActionButtons/SingleButtons.module.css, like is already done for primary button

[fabclj]

The downloadable Image button is now disabled.
I tested src/messages/Image/ImageThumb.tsx and looks back to work when you just get the action from useMessageContext and pass it to PrimaryButton

[fabclj]

It works as expected, just that 2 css issues on the comments above.

[dshire]

It works as expected, just that 2 css issues on the comments above.

Thanks, fixed both