refactor(metactl): change to subcommands & support transfer-leader

[everpcpc]

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Summary

databend-meta command line tools

Usage: databend-metactl [OPTIONS] [COMMAND]

Commands:
  status                 
  export                 
  import                 
  transfer-leader        
  bench-client-num-conn  
  help                   Print this message or the help of the given subcommand(s)

Options:
      --log-level <LOG_LEVEL>                  [default: INFO]
      --grpc-api-address <GRPC_API_ADDRESS>    DEPRECATE: use subcommand instead [env: METASRV_GRPC_API_ADDRESS=] [default: 127.0.0.1:9191]
      --import                                 DEPRECATE: use subcommand instead
      --export                                 DEPRECATE: use subcommand instead
      --raft-dir <RAFT_DIR>                    DEPRECATE: use subcommand instead
      --export-chunk-size <EXPORT_CHUNK_SIZE>  DEPRECATE: use subcommand instead
      --db <DB>                                DEPRECATE: use subcommand instead [default: ]
      --initial-cluster <INITIAL_CLUSTER>      DEPRECATE: use subcommand instead
      --id <ID>                                DEPRECATE: use subcommand instead [default: 0]
  -h, --help                                   Print help (see more with '--help')
  -V, --version                                Print version

Tests

• Unit Test
• Logic Test
• Benchmark Test
• No Test - Explain why

Type of change

• Bug Fix (non-breaking change which fixes an issue)
• New Feature (non-breaking change which adds functionality)
• Breaking Change (fix or feature that could cause existing functionality not to work as expected)
• Documentation Update
• Refactoring
• Performance Improvement
• Other (please describe):

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This change is 

[drmingdrmer]

It's a super nice refinement to the metactl! Love it!

Reviewed 9 of 9 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @everpcpc)