Feat/refactor arena graphql query

[boscohyun]

• resolves Use arenaParticipant MongoDB collection in the "arena" GraphQL query #473
• introduce and register ArenaParticipantRepository
• use ArenaParticipantRepository in ArenaResolver
• implement ArenaParticipantType for decouple the ArenaParticipantDocument from arena's response GraphQL schema
• fix runtime errors

GraphQL Schema Changes

query { arena { leaderboard {} } }

before

query {
  arena {
    leaderboard(ranking: 1, length: 10) {
      address
      championshipId
      rank
      round
      storedBlockIndex
      arenaInformation {
        address
        lose
        purchasedTicketCount
        ticket
        ticketResetCount
        win
      }
      arenaScore {
        address
        score
      }
      simpleAvatar {
        address
        agentAddress
        blockIndex
        characterId
        combinationSlotAddresses
        ear
        exp
        hair
        lens
        level
        name
        rankingMapAddress
        tail
        updatedAt
        version
      }
    }
  }
}

after

query {
  arena {
    leaderboard(ranking: 1, length: 10) {
      agentAddress
      avatarAddress
      cp
      ear
      exp
      hair
      lastBattleBlockIndex
      lens
      level
      lose
      name
      portraitId
      purchasedTicketCount
      rank
      score
      tail
      ticket
      ticketResetCount
      win
    }
  }
}

query { arena { leaderboardByAvatarAddress {} } }

before

query {
  arena {
    leaderboardByAvatarAddress(avatarAddress: "") {
      address
      championshipId
      rank
      round
      storedBlockIndex
      arenaInformation {
        address
        lose
        purchasedTicketCount
        ticket
        ticketResetCount
        win
      }
      arenaScore {
        address
        score
      }
      simpleAvatar {
        address
        agentAddress
        blockIndex
        characterId
        combinationSlotAddresses
        ear
        exp
        hair
        lens
        level
        name
        rankingMapAddress
        tail
        updatedAt
        version
      }
    }
  }
}

after

query {
  arena {
    leaderboardByAvatarAddress(avatarAddress:"") {
      agentAddress
      avatarAddress
      cp
      ear
      exp
      hair
      lastBattleBlockIndex
      lens
      level
      lose
      name
      portraitId
      purchasedTicketCount
      rank
      score
      tail
      ticket
      ticketResetCount
      win
    }
  }
}