Create one Type object per type reference

[oxisto]

Fixes #1768

[codecov]

Codecov Report

Attention: Patch coverage is 70.90909% with 16 lines in your changes missing coverage. Please review.

Project coverage is 75.08%. Comparing base (afad877) to head (e994814).

Files with missing lines	Patch %	Lines
...aisec/cpg/passes/inference/DFGFunctionSummaries.kt	69.04%	5 Missing and 8 partials ⚠️
...ec/cpg/passes/JavaExternalTypeHierarchyResolver.kt	50.00%	2 Missing ⚠️
...s/kotlin/de/fraunhofer/aisec/cpg/test/TestUtils.kt	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
...main/kotlin/de/fraunhofer/aisec/cpg/TypeManager.kt	83.33% <100.00%> (+0.47%)	⬆️
...otlin/de/fraunhofer/aisec/cpg/graph/NodeBuilder.kt	70.53% <ø> (ø)
...otlin/de/fraunhofer/aisec/cpg/graph/TypeBuilder.kt	57.50% <100.00%> (-7.21%)	⬇️
...n/de/fraunhofer/aisec/cpg_vis_neo4j/Application.kt	55.89% <ø> (-0.39%)	⬇️
...s/kotlin/de/fraunhofer/aisec/cpg/test/TestUtils.kt	72.34% <50.00%> (+0.76%)	⬆️
...ec/cpg/passes/JavaExternalTypeHierarchyResolver.kt	79.41% <50.00%> (+0.62%)	⬆️
...aisec/cpg/passes/inference/DFGFunctionSummaries.kt	74.35% <69.04%> (+5.64%)	⬆️

... and 6 files with indirect coverage changes

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