Filter Trait - Reorganization

[lrljoe]

This PR re-organises the Filter Traits into a new namespace, to simplify maintenance

Presently pending test creation

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:

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2. Did you update all templates (if applicable)?
3. Did you add the relevant documentation (if applicable)?
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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?
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[codecov]

Codecov Report

Attention: Patch coverage is 87.30159% with 24 lines in your changes missing coverage. Please review.

Project coverage is 91.48%. Comparing base (5b23dfb) to head (eaadfb5).

Files with missing lines	Patch %	Lines
src/Traits/Core/HasCustomAttributes.php	38.46%	8 Missing ⚠️
...aits/Filters/Configuration/FilterConfiguration.php	76.66%	7 Missing ⚠️
src/Traits/Filters/Helpers/FilterMenuHelpers.php	78.12%	7 Missing ⚠️
src/Traits/Filters/ManagesFilters.php	83.33%	2 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                @@
##             development    #2181      +/-   ##
=================================================
+ Coverage          90.98%   91.48%   +0.49%     
- Complexity          2011     2018       +7     
=================================================
  Files                218      228      +10     
  Lines               4539     4544       +5     
=================================================
+ Hits                4130     4157      +27     
+ Misses               409      387      -22     

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