Project structure makes import ambiguous

[zhongnansu]

Currently, the project structure is using src as a top level folder, which lead to an issue while importing in a python project.

While it doesn't affect cli users, developers have to import src to import SQL CLI package and use its modules for development.

Need to figure out a way for better organizing the project/modules. Developers should be able to import modules from SQL CLI packages by something likefrom odfe_sql_cli.esconnection import ESConnection, where odfe_sql_cli is package name and esconnection is module name.