[RFC 65] Add custom namespace columns to CNA

[BasLee]

Add custom namespace columns to CNA events

Changes

• Add ANNOTATION_JSON column to sample_cna_event table
• Add CustomNamespaceParser.java that imports custom columns of both mutations and CNA's
• Expose the custom columns as namespaceColumns in the DiscreteCopyNumberController (see DiscreteCopyNumberDataMixin)

Tests

• Cna importer imports custom namespace columns, see: TestImportCnaDiscreteLongData
• API exposes custom namespace columns, see: DiscreteCopyNumberServiceImplTest and DiscreteCopyNumberControllerTest

Checks

• When importing es0, custom namespace columns should be added to the response of ./api/molecular-profiles/study_es_0_gistic/discrete-copy-number :

response.filter(e => e.entrezGeneId === 116983 && e.sampleId === 'TCGA-A2-A04U-01').map(e => e.namespaceColumns)
{
   "MyNamespace": {
       "column1": "value1b",
       "column2": "value2b"
   },
   "MyNamespace2": {
       "blarp": "bluirp2"
   }
}

[Luke-Sikina]

Very small changes. Nice job!

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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