Support synonyms for terminologies

[chgl]

It's possible to define or extend terminologies with custom terms that map to standard concepts - e.g. by adding synonyms for ICD diagnoses (https://help.averbis.com/display/AKB/How+to+extend+text+analysis+with+additional+concepts).

The following example added "fibrosierende weichteilerkrankungen" as a synonym for ICD K66.2. In this case, types with source DiagnosisExtension_1.0 should be treated as ICD10GM_2021.

{
      "begin": 26,
      "end": 78,
      "type": "de.averbis.types.health.Diagnosis",
      "coveredText": "fibrosierende weichteilerkrankungen\n\n(morbus ormond)",
      "id": 5966,
      "negatedBy": "kein",
      "side": null,
      "matchedTerm": "fibrosierende Weichteilerkrankung",
      "verificationStatus": "NEGATED",
      "kind": null,
      "confidence": 0.0,
      "onsetDate": null,
      "source": "DiagnosisExtension_1.0",
      "clinicalStatus": null,
      "approach": null,
      "laterality": null,
      "dictCanon": "Retroperitonealfibrose",
      "conceptId": "K66.2",
      "belongsTo": null,
      "uniqueId": "DiagnosisExtension_1.0:K66.2"
    },
    {
      "begin": 111,
      "end": 124,
      "type": "de.averbis.types.health.Diagnosis",
      "coveredText": "morbus ormond",
      "id": 5988,
      "negatedBy": "morbus ormond",
      "side": null,
      "matchedTerm": "Morbus Ormond",
      "verificationStatus": "NEGATED",
      "kind": null,
      "confidence": 0.0,
      "onsetDate": null,
      "source": "ICD10GM_2021",
      "clinicalStatus": null,
      "approach": "DictionaryLookup",
      "laterality": null,
      "dictCanon": "Retroperitonealfibrose",
      "conceptId": "K66.2",
      "belongsTo": null,
      "uniqueId": "ICD10GM_2021:K66.2"
    }

We should allow configuring synonyms for well-known sources (such as ICD, LOINC, SNOMED) to support custom terminologies.