No longer wrapping complex types in an auxiliary JSON object

[rodinaarssen]

Complex types were wrapped in an auxiliary object to avoid ambiguities between the JSON representation of containers and "lists as a sole argument" on the JSON-RPC level. This is not necessary, as complex types are not automatically deserializable through this path anyway. This PR removes wrapping around complex types, leaving rationals as the only values that are wrapped when encoding values as JSON objects.

FIxes usethesource/rascal-language-servers#944

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 46%. Comparing base (3ba2f34) to head (10fbde8).

Files with missing lines	Patch %	Lines
src/org/rascalmpl/ideservices/GsonUtils.java	0%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##              main   #2599   +/-   ##
=======================================
  Coverage       46%     46%           
- Complexity    6623    6629    +6     
=======================================
  Files          793     793           
  Lines        65638   65631    -7     
  Branches      9831    9830    -1     
=======================================
+ Hits         30480   30485    +5     
+ Misses       32804   32787   -17     
- Partials      2354    2359    +5     

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