Implement Milvus CLI by Python Click

What this post added

This post details the implementation of a Milvus Command Line Interface (CLI) using the Python Click library. It covers the creation of command groups and sub-groups, defining options and flags for commands, adding arguments, implementing confirmation prompts for destructive actions, using prompts for user input, and incorporating choice validation for user inputs. The CLI is designed to provide a continuous connection to Milvus instances and manage operations through an interactive prompt.