Improve detection of collection element type

[bkoelman]

With this PR, the collection element type for custom collection types that have no or multiple type parameters is now correctly detected.

JADNC v5.7.0 added internal assertions on the IQueryable<T> element type T to make it easier to track errors/bugs. It uses CollectionConverter.FindCollectionElementType to determine the element type, but that works only with types that have exactly one generic type parameter. MongoDB uses an internal type MongoQuery<TDocument, TOutput> : IQueryable<TOutput>, which causes assertion failures. This PR fixes that by properly walking up the interface hierarchy to infer that TOutput is the element type.

QUALITY CHECKLIST

• Changes implemented in code
• Complies with our contributing guidelines
• Adapted tests
• N/A: Documentation updated

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.78%. Comparing base (3ad189d) to head (f7949df).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1720   +/-   ##
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  Coverage   90.78%   90.78%           
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  Files         467      467           
  Lines       14611    14612    +1     
  Branches     2299     2302    +3     
=======================================
+ Hits        13264    13265    +1     
  Misses        917      917           
  Partials      430      430           

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