Support a non-interactive mode so that it is possible to build scripts with the milvus_cli

I would like to create a bash script that does something like this: 

```bash

MY_INDEX_VALUE=$1

milvus_cli connect -uri http://localhost:19530
milvus_cli use database my_database

milvus_cli query \ 
    --collection my_collection 
    --query "MY_INDEX=$MY_INDEX_VALUE"
    --fields "MY_INDEX, MY_EMBEDDING"
```

Currently only interactive mode is supported.  