feat: index sample command

[LexLuthr]

The PR adds a new cli command to Curio. It fetches some random CIDs from the indexed piece for any sampling needs.

# curio cli --machine 172.20.0.4:12300 index-sample baga6ea4seaqfu34hobrswd6icu5mmfckr6vs4ki54n7rtzuunsdtj3pnstffeoq
remote node version: [1 24 5]
Multihash HEX                                                         Multihash B58                                   CID v1                                                       
1220bb5ec163482b437a04097f4ace29e0d90a5844ddb0ec3e378679b4177e0d13bd  Qmax4kXGccJUUMMQ4X7KaZGEQLvcgaJxdyxg3wttGcXtEY  bafybeif3l3awgsblin5aicl7jlhctygzbjmejxnq5q7dpbtzwqlx4ditxu  
1220f0891135e2eae25ef88ffae3b303c4112d81c9820c6dc53136be65c226382221  QmeXbnC1h3t5VWgP6aL2nsVfEZDHcGjysgh8ohqgW8u5Ep  bafybeihqreitlyxk4jpprd724ozqhrarfwa4taqmnxctcnv6mxbcmobcee  

root@0a2a48a645e9:/app# curio cli --machine 172.20.0.4:12300 index-sample --json baga6ea4seaqfu34hobrswd6icu5mmfckr6vs4ki54n7rtzuunsdtj3pnstffeoq
remote node version: [1 24 5]
{
  "1220bb5ec163482b437a04097f4ace29e0d90a5844ddb0ec3e378679b4177e0d13bd": {
    "b58": "Qmax4kXGccJUUMMQ4X7KaZGEQLvcgaJxdyxg3wttGcXtEY",
    "cid": "bafybeif3l3awgsblin5aicl7jlhctygzbjmejxnq5q7dpbtzwqlx4ditxu"
  },
  "1220f0891135e2eae25ef88ffae3b303c4112d81c9820c6dc53136be65c226382221": {
    "b58": "QmeXbnC1h3t5VWgP6aL2nsVfEZDHcGjysgh8ohqgW8u5Ep",
    "cid": "bafybeihqreitlyxk4jpprd724ozqhrarfwa4taqmnxctcnv6mxbcmobcee"
  }
}