Rename facet form builders to filter form builders because people use the word 'filters' more

[loevgaard]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 32.72%. Comparing base (9499590) to head (7ae6886).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/Form/Builder/SearchFormBuilder.php	0.00%	2 Missing ⚠️
src/Document/Attribute/Facetable.php	0.00%	1 Missing ⚠️
src/SetonoSyliusMeilisearchPlugin.php	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #43   +/-   ##
=========================================
  Coverage     32.72%   32.72%           
  Complexity      561      561           
=========================================
  Files           113      113           
  Lines          1925     1925           
=========================================
  Hits            630      630           
  Misses         1295     1295           

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