Modification of Loading widget to make it a universal loading widget

[utkarshshendge]

• Parent issue : Refactoring of codebase and separation on data/UI #715

• Issue Description:
  Modification of widget declared in loading.dart to make it a universal loading widget. This widget can be provided with properties like isCurrentOrgNull resulting in asking the user to join an organization, isNetworkError resulting in showing an error image and appropriate text, refresh function, and message resulting in text displaying the message provided (like 'no post to show create one', 'no events to show create one', etc) and a refresh button which calls the refresh function again to fetch the data if other users add data to the server.

• Issue Severity:
  Low

• Environment Details:
  Project Level : loading.dart

• Observed Behaviour:
  Loading stateful widget with few parameters.

• Expected Behaviour:
  Make the Loading widget as universal loading widget.

• Does this issue need immediate attention?
  No

• Please ask mentors/maintainers to assign if you are willing to work on this issue.

[Raunakk02]

Can I work on this issue @Sagar2366 sir?

[palisadoes]

Issue #700 has now been integrated into the pull request process. It will flag all Dart files that are longer than 300 lines to help with readability. Please make sure your contribution reduces file sizes to within this limit.

[Raunakk02]

Issue #700 has now been integrated into the pull request process. It will flag all Dart files that are longer than 300 lines to help with readability. Please make sure your contribution reduces file sizes to within this limit.

Sure @palisadoes !