OLMIS-7643: Create endpoint for data export (#43)
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OLMIS-7643: Added DataExportController and DataExportControllerTest classes
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OLMIS-7643: Added RESOURCE_PATH constant and exportData method with javadoc comment
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OLMIS-7643: Added annotations for DataExportController class
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OLMIS-7643: Added exportDataTest method to check the response status
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OLMIS-7643: Added @ResponseBody annotation, change exportData return type to ResponseEntity and RESOURCE_PATH value
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OLMIS-7643: Added api-definition
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OLMIS-7643: Added change information to CHANGELOG.md
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OLMIS-7643: Changed mapping annotations
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OLMIS-7643: Change application version in CHANGELOG.md
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OLMIS-7643: Change endpoint description in api-definition.yaml
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OLMIS-7643: Change exportData method description
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OLMIS-7643: Removed redundant lines, changed annotations, refactored test class to use mockito
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OLMIS-7643: Remove unnecessary constants