Extend the elasticsearch persistenceProvider with authentication methods #170

Is your feature request related to a problem? Please describe.
As a security developer i would like to configure an authenticated connection for elasticsearch in the corresponding persistence provider.

Describe the solution you'd like
There are two different authentication methods currently supported by elasticsearch:

• Basic Authentication: https://www.elastic.co/guide/en/elasticsearch/client/java-rest/current/_basic_authentication.html
• Token Based Authentication: https://www.elastic.co/guide/en/elasticsearch/client/java-rest/current/_other_authentication_methods.html

These configuration options must be configurable via environment variables.

Additional context

• Code to improve: https://github.com/secureCodeBox/engine/blob/master/scb-persistenceproviders/elasticsearch-persistenceprovider/src/main/java/io/securecodebox/persistence/elasticsearch/ElasticSearchPersistenceProvider.java