Fix the indentation of default values during ADL serialization

[J3173]

Follow-up of #651

When serializing Archetypes, indentation was applied incorrectly to default values. Spaces were added to multiline ODIN strings to each line after the first and serialization of unparsed JSON got extra unnecessary indentation applied.

For the indentation to work correctly the process is split into three cases:

• Unparsed values in DefaultValueContainers (e.g. when no metamodels or mappers are available or the format is unknown): These will be serialized as-is in the DefaultValueContainer. For ODIN this will be unformatted, as any formatting is lost during parsing. For JSON and other formats the serialization will be the same as in the original ADL, keeping any original indentation without adding any extra.
• Parsed values serialized as JSON: This will use the current process of serializing the default value to JSON and then indenting each line in the serialized JSON to the correct level, as this can be safely done with JSON.
• Parsed values serialized as ODIN: This will use the new ODINPrettyPrinter introduced in Fix indenting of multiline ODIN strings in ADL #651 to directly serialize the ODIN with the correct indentation.

This will make the roundtrip serialization of unparsed values and parsed values as ODIN idempotent, as the seriazization of parsed values as JSON already was.

[codecov]

Codecov Report

Attention: Patch coverage is 91.66667% with 2 lines in your changes missing coverage. Please review.

Project coverage is 71.99%. Comparing base (88daaf1) to head (1daa7b3).

Files with missing lines	Patch %	Lines
...izer/adl/constraints/CComplexObjectSerializer.java	91.30%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #653      +/-   ##
============================================
+ Coverage     71.94%   71.99%   +0.04%     
- Complexity     7087     7093       +6     
============================================
  Files           672      672              
  Lines         23137    23149      +12     
  Branches       3755     3755              
============================================
+ Hits          16647    16665      +18     
+ Misses         4745     4742       -3     
+ Partials       1745     1742       -3     

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[MattijsK]

Also looks great!