fix(filters): GraphQL Custom Filter Operator could be anything

[ghiscoding]

• e.g. the Example 10 creates a new Like operator is not part of the current OperatorType list. So it should really accept any type as custom operator (as long as the end user deals with this new type on their end)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.8%. Comparing base (7c61846) to head (eb39350).

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #1562    +/-   ##
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  Coverage    99.8%   99.8%            
=======================================
  Files         198     198            
  Lines       21727   21727            
  Branches     7135    7273   +138     
=======================================
  Hits        21666   21666            
  Misses         55      55            
  Partials        6       6            

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