feat: introduce "{network}/avatars/{address}"

[boscohyun]

request

curl -X 'GET' \
  'http://localhost:5195/odin/avatars/0xe56d432da2032f6c851943b76c4a41815baabb54' \
  -H 'accept: text/plain'

response

{
  "agentAddress": "0x6132331720A774274d6E51CaeAd375068cC00505",
  "avatarAddress": "0xe56d432da2032f6C851943b76C4a41815baaBB54",
  "avatarName": "SuhoDaddy",
  "level": 299,
  "actionPoint": 120,
  "dailyRewardReceivedIndex": 10433055
}