Implement the new `Collection Introduction` flow

[jonata97]

Caso de Uso/Use Case:

The goal is to add a collection introduction, once the user tries to execute any collection for the first time, so it explains a little bit more how to take most out of the app.

Proposta/Proposal:

Here you can see the full UI flow on Figma.

[matuella]

Added needs more info as there is still a lack of business logic definitions, such as:

• Will we allow for it to be closed by dragging it down or force the user to tap on the "Got it"?
• We will show this only once when the user opens the first collection or when the taps "Study Now"?
• Will this sheet shrink to only the height it needs to occupy or will it always open full (like in the Figma file)?
• What will be the textual + images structures for all supported languages today?

[jonata97]

Good questions. I believe this should be discussed in a call with our design team and then filled up here. My suggestion is that you or Girotto talk to bruno about this details