feat: GridView.itemAspectRatio (Flutter)

[Tiagoperes]

Signed-off-by: Tiago Peres França [email protected]

Description and Example

The GridView in Flutter doesn't accept items with arbitrary size, i.e. if the gridview has an item with width and height, this is not used by the gridview to calculate the size of the cell, instead, by default, every item in the gridview is a square. According to the Flutter documentation, we also can't set manually the size of the gridView items, instead, in Flutter, we must use a property called childAscpectRatio, which tells the aspect ratio of each cell.

Unfortunately this is incompatible with the current contract of Beagle's GridView. To not mess too much with this contract (which would require changes in all platforms) and also have a usable GridView in Flutter, I exposed childAscpectRatio as the Beagle property itemAspectRatio. I stated in the API docs that this property is only valid for Flutter.

Docs PR: ZupIT/beagle-docs#838

Checklist

Please, check if these important points are met using [x]:

• I read the PR Guide and followed the process outlined there for submitting this PR.
• I avoided breaking changes by not changing public APIs that people rely on.
• I am willing to follow-up on review comments in a timely manner.
• I have made the documentation changes or I created an issue explaining how to document this change on Docs issues. Please link the issue here: