Start of CrowdAction Form

[andre-tm-hui]

Added:

• CrowdActionFormModal - a popup modal containing the form
• CrowdActionInfoForm - to be implemented in a later PR
• CountryField & CountrySearch - A drop-down searchable Country selector
• FormField - Takes a child (text input, button etc.) and places a label above
• FormHeader - Creates a header for each sub-section of the form
• TextFormField - Creates a text-input form field with a callback
• FieldPopup - To be used in a stack, creates a popup positioned around another widget
• Inverted RectangularButton

Added dependencies:

• defer_pointer - Used to render the FieldPopup correctly
• country_codes - Used for country search
• country_icons - Used for country search

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit 6175b06):

https://collaction-development--pr40-feat-gh-24-crowdacti-k5ze4orm.web.app

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[dromerolovo]

I've taken a quick look at it, so far looks like a nice approach. I'm going to review it more thoroughly tomorrow and think more about the architecture.