run $expand on type instead of instance if url is preset

[TahaAttari]

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Codecov Report

Attention: Patch coverage is 62.50000% with 12 lines in your changes missing coverage. Please review.

Project coverage is 62.02%. Comparing base (16a4d5a) to head (ac08bfd).

Files	Patch %	Lines
...f/fhir/utility/client/TerminologyServerClient.java	62.50%	3 Missing and 9 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #483      +/-   ##
============================================
+ Coverage     62.00%   62.02%   +0.02%     
- Complexity     3552     3558       +6     
============================================
  Files           328      328              
  Lines         17574    17603      +29     
  Branches       2707     2715       +8     
============================================
+ Hits          10897    10919      +22     
  Misses         5472     5472              
- Partials       1205     1212       +7     

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[barhodes]

This does not seem correct to me. The expansionParameters object being passed in here is a contained Parameters resource in the rootSpecificationLibrary. How would that singular Parameters object contain the url parameter for each ValueSet we are expanding?