feat: add shimmer to all pages

[AugustoVSoares]

Closes #1568 Adding shimmer to all pages (WIP)

Review checklist

• [ ] Terms and conditions reflect the current change
• [ ] Contains enough appropriate tests
• [ ] If aimed at production, writes a new summary in whatsnew/whatsnew-pt-PT
• [ ] Properly adds an entry in changelog.md with the change
• [ ] If PR includes UI updates/additions, its description has screenshots
• [ ] Behavior is as expected
• [ ] Clean, well-structured code

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 60%. Comparing base (0a63594) to head (4387f82). :warning: Report is 47 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #1613   +/-   ##
=======================================
  Coverage       60%     60%           
=======================================
  Files            2       2           
  Lines           81      81           
=======================================
  Hits            48      48           
  Misses          33      33           

:rocket: New features to boost your workflow:

• :snowflake: Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[pedroafmonteiro]

Just awaiting #1642 to be merged to develop before reviewing this PR. Just a heads up, it will probably need some changes!

[pedroafmonteiro]

Hi @AugustoVSoares! Due to new changes regarding riverpod, this PR needs some conflict resolution before getting this tested and merged. Thanks!