Add POIs to favorites

[f1sh1918]

As a user I want to add pois to favorites to find them easier on the map and store list

Acceptance Criteria:

• a store can be added to favorites by clicking favorites cta button on the store detailpage (icon changes to filled)
• the store will be marked with a favorite icon on the map instead of the category icon. The icon should have the same size as the other icons
• In the ButtomNavigationBar a "Favorite" item should be added that navigates to the favorites page
• the favorites page contains a list of acceptance stores the user added to favorites. It should behave like the of the search page. (click on the item -> store detail page)
• a favorite store can be removed from favorites on the store detail page by clicking the favorites button (icon changes to outlined)
• the favorites will be saved on the device, so they will maintain after the app was closed

Technical Tasks:

• add a favorite icon to the mapstyle repository
• provide the functionality to add/remove a store to the favorites on the store detail page. save the information on the device
• mark the favorites with the favorites icon on the map
• add a "favorite" BottomNavigationBar item
• add a favorite page that shows store favorites. style similar to the search list

Design:

• provide an material icon for the favorites
• provide a cta/toggle for the detail page to add the store to favorites
• provide a design that includes a new favorite item in the BottomActionBar
• provide a design for the favorites pages that should be similar/equal to the SearchList

Some additional info:

To simplify this issue #750 should be done before

[IsabellaTG]

@f1sh1918 please review: https://www.figma.com/file/SDoGnXIjCCXpE1tAAJkRVc/entitlementcard?type=design&node-id=280%3A445&mode=design&t=wYIZWn6bcdOdFw8W-1

[f1sh1918]

@IsabellaTG i addressed some comments to you

[seluianova]

@dkehne could you please tell me if we need the ability to enable/disable this feature in the configuration per project?

[dkehne]

@seluianova no, we do not need to. it can be published for all projects