Reduce DART file sizes to make the PR automated checks work.

[palisadoes]

Describe the bug

1. One of our pull request checks is to ensure that Dart files have under 300 lines of code. This is because we found many instances of duplicated code and felt that adding a 300 line limit would encourage people to create reusable code.
2. We have 9 files in the repository that are over 300 lines long.
3. These need to be reduced in size by using efficiently elegant coding techniques.
4. We need this fixed so that contributors can have all their checks pass.

To Reproduce
Steps to reproduce the behavior:

1. Submit a PR with over 300 lines of code.
2. Look at the failed checks. It shows the files in the Actual Behavior section to be too large

Expected behavior
Pull requests passing all GitHub action tests

Actual behavior

The files below are consistently flagged as being too large.

Line count:   482 File: /home/runner/work/talawa/talawa/lib/views/pages/events/edit_event_dialog.dart
Line count:   371 File: /home/runner/work/talawa/talawa/lib/views/pages/organization/organization_members.dart
Line count:   547 File: /home/runner/work/talawa/talawa/lib/views/pages/organization/update_profile_page.dart
Line count:   320 File: /home/runner/work/talawa/talawa/lib/views/pages/organization/update_organization.dart
Line count:   355 File: /home/runner/work/talawa/talawa/lib/views/pages/organization/organization_settings.dart
Line count:   308 File: /home/runner/work/talawa/talawa/lib/views/pages/login_signup/register_form.dart
Line count:   542 File: /home/runner/work/talawa/talawa/lib/views/pages/login_signup/set_url_page.dart
Line count:   973 File: /home/runner/work/talawa/talawa/lib/services/queries_.dart
Line count:   312 File: /home/runner/work/talawa/talawa/test/widget_tests/register_form_test.dart

Screenshots

Additional details
None

[anand-aman]

Can I work on this issue? @palisadoes

[palisadoes]

@anand-aman you can verify the file sizes by running the countline.py script.

[anand-aman]

@anand-aman you can verify the file sizes by running the countline.py script.

Ok will check it. Thanks

[palisadoes]

@anand-aman how's progress?

[anand-aman]

@palisadoes I am working on it. While working on this issue I came across this bug #833.

[anand-aman]

@palisadoes
Sir, I have reduced the size of all files (except queries_.dart which is 973 lines) and tested it.
Can we keep queries_.dart as an exception till the new UI is implemented?

Thank You
Aman Anand

[palisadoes]

@anand-aman yes that is OK. Please submit the PR so the others can use your work as an example.

[anand-aman]

Update:
Merged with PR #852.
Refactoring of queries.dart_ is pending and will be done after code freeze.