Enricher no longer parses the enrichment files with the '.hocon' extension

Hi

In version 5.x enricher was able to parse enrichment files with `.hocon` extension. In version 6.x it completely ignores all the enrichment files ending with `.hocon`. 

Simply changing the enrichment extensions to `.json` resolves the issue, but we use environment variables inside enrichment files, and JSON syntax treated as incorrect which is a slight inconvenience.