Strongly type 'rulesToQuery' return based on return from 'convert' param

[jarpoole]

Fixes #875

Backwards compatibility should be maintained because:

1. Any consumer explicitly importing and specifying T in RuleToQueryConverter<T> can continue to do so because the new generic param has a default
2. Likewise for consumers choosing to explicitly specify T in rulesToQuery<T>

[jarpoole]

@stalniy not quite sure how to proceed as CI seems to be broken in master as well...

[stalniy]

I’ll check. Thanks for the contribution!

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e076b31) 94.93% compared to head (7b978ee) 94.98%.
Report is 61 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #876      +/-   ##
==========================================
+ Coverage   94.93%   94.98%   +0.04%     
==========================================
  Files          34       34              
  Lines         731      738       +7     
  Branches      175      177       +2     
==========================================
+ Hits          694      701       +7     
  Misses         20       20              
  Partials       17       17              

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