Adaptive cards

[kwinto]

This PR adds support for Adaptive Cards.

Also:

• Improves demo page
• Moves demo page to test to keep the code only relevant for the package in src

To test:

npm run dev

press 'o' + <Enter>

Note: there seem to be an issue related to Swiper+Adaptive Cards dependencies, it currently breaks test runs.

[fabclj]

I like the new demo page, but it would be great to integrate all messages types.
Also it would be great to solve the issue about swiper and adaptive card.

[fabclj]

I have run the adaptive card on webchat locally. I list here the first findings:

• Primary button should have height 44px and cursor: pointer
• The card width should be max 295px like all messages
• Textarea scrollbar is not styled as Figma requirments

[kwinto]

• Primary button should have height 44px and cursor: pointer
  Fixed

• The card width should be max 295px like all messages
  Full width for AC messages is specified in Figma

• Textarea scrollbar is not styled as Figma requirments
  I fixed it as far as it is possible with CSS. We lack the possibility to have a margin and coloured "track" at the same time on a scrollbar.

Further improvements here will need a custom AC render or some kind of field override, as we are at the limit of what is possible with to do with pure CSS.

[kwinto]

I like the new demo page, but it would be great to integrate all messages types. Also it would be great to solve the issue about swiper and adaptive card.

Tracked in new stories for the next sprint.

[fabclj]

Text area now has scrollbar but is still not fitting the design requirements