Remove project databases from extensions.

[otaviojava]

Once we've moved the extensions to https://github.com/eclipse/jnosql-databases

It is time to remove those databases behaviors from the extensions

Task

• [x] Remove those modules from the source code:

  • jnosql-arangodb-extension
  • jnosql-cassandra-extension
  • jnosql-couchbase-extension
  • jnosql-elasticsearch-extension
  • jnosql-hazelcast-extension
  • jnosql-mongodb-extension
  • jnosql-orientdb-extension
  • jnosql-solr-extension

• [x] Update the README to remove any references around those databases

• [x] Add on Change-log those items as removed