App Suite DocumentConverter

SCR-1557

Summary: Removal of remoteCache.enabled flag in Helm chart values, making CacheService usage depending on availability of CacheService and/or via explicit setting of url

Making CacheService usage in clients depending on availability of CacheService availability within cluster. In addition, allow to specify external URL for CacheService and allow to disable usage of CacheService via setting URL blank.

To specify for DocumentConverter client:

core-mw:
  ## -- Configuration for DocumentConverter client
  documentConverterClient:
    cache:
      remoteCache: {}
        # url: https://optional-cache-host:8001/cache or blank to disable usage of CacheService in case core-cacheservice.enabled=true

To specify for DocumentConverter server:

core-documentconverter:
  ## -- Configuration for DocumentConverter server
  documentConverter:
    cache:
      remoteCache: {}
        # url: https://optional-cache-host:8001/cache or blank to disable usage of CacheService in case core-cacheservice.enabled=true