Add admin commands

[hackerwins]

Description:

Add admin commands.

Let's implement admin commands, starting with finding and deleting documents.

# starts server
$ yorkie server
INFO	default	backend created: id: ca81i5jhkdflkq76edr0, rpc: localhost:11103: db: memory
INFO	default	serving profiling on 11102
INFO	default	serving RPC on 11101
INFO	default	serving admin on 11103

$ yorkie --admin-addr localhost:11103 document describe <doc-key>
$ yorkie --admin-addr localhost:11103 document rm <doc-key>

Task

• Create project: yorkie project create <name>
• List projects: yorkie project ls
• History: yorkie history <project_name> <document_key>
• List documents: yorkie document ls <project_name>
• Remove project: yorkie project rm <name>
• Remove document: yorkie document rm <project_name> <document_key>

Why:

• Users can manage documents or projects using CLI.

[zacscoding]

can i try this issue? 🙇 cc. @dc7303