lmware always creates collection in 'default' vector database #249

[virunew]

adding embedding_db_name parameters at appropriate places to allow creating embeddings in a non 'default' vector database. This applies to Milvus only right now, other vector databases' code is not touched as I am not aware of their structure. This will work with current examples. Out of box examples and code which does not specify embedding_db_name will continue to create collections in default databse