feat: handle `ArenaParticipant` account state with diff poller

[boscohyun]

This resolves #472.

• Implement Lib9c.Models.ArenaParticipant.
• Introduce UnsupportedModelVersionException.
• Implement ArenaParticipantDocument.
• Implement ArenaParticipantDocumentConverter.
• Implement and register ArenaParticipantHandler
• Use Newtonsoft's Json library in Mimir.MongoDB project.
• Add InsertionDate when it needed.

[boscohyun]

@moreal Could you review again? I've rebased this branch with new main branch head.

[sentry-io[bot]]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ Failed http request url: http://odin-rpc-1.nine-chronicles.com/graphql, retry:1, error: `` View Issue
• ‼️ System.Threading.Tasks.TaskCanceledException: A task was canceled. Handler/ArenaParticipantHandler.cs in async Tas... View Issue

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