Add a metadata CLI tool similar to etcdctl

[WenyXu]

What problem does the new feature solve?

We need a CLI tool to interact with the metadata layer of GreptimeDB, similar to how etcdctl allows direct interaction with etcd. This tool would help operators inspect, query, and manage metadata entries.

What does the feature do?

Expected Features:

• greptime-meta-cli get : Retrieve a metadata entry. (P0)
• greptime-meta-cli del : Delete a metadata entry. (P0)
• greptime-meta-cli list : List entries under a prefix.
• greptime-meta-cli put : Add or update an entry. (Optional)

Implementation challenges

No response

[yinheli]

So as I understand it, the goal is to have the CLI interact with Metasrv using the meta-client, right?

[WenyXu]

So as I understand it, the goal is to have the CLI interact with Metasrv using the meta-client, right?

Yes

[yinheli]

May I have a try? 😘

[WenyXu]

May I have a try? 😘

Of course. However, please note that this task might not be easy to test. Reading the tests-integration code might give you some ideas.