Loading Placeholder Adjustments

[lrljoe]

• Migrate the Loading Placeholder styling methods into a new Trait
• Move the custom loading placeholder blade within the default "td"

TO DO:

• Docs
• Tests

All Submissions:

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

New Feature Submissions:

1. Does your submission pass tests and did you add any new tests needed for your feature?
2. Did you update all templates (if applicable)?
3. Did you add the relevant documentation (if applicable)?
4. Did you test locally to make sure your feature works as intended?

Changes to Core Features:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your core changes, as applicable?
• Have you successfully ran tests with your changes locally?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.29%. Comparing base (0c8ec45) to head (cef3b30).
Report is 129 commits behind head on development.

Additional details and impacted files

@@                Coverage Diff                @@
##             development    #1987      +/-   ##
=================================================
+ Coverage          87.30%   88.29%   +0.98%     
- Complexity          1672     1857     +185     
=================================================
  Files                150      176      +26     
  Lines               3891     4287     +396     
=================================================
+ Hits                3397     3785     +388     
- Misses               494      502       +8     

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