Chatlog: Add minimal DB retry logic

[DieterReinert]

We encountered a crash on a chat page with the following stack trace:

A chat page crashed: error: restart transaction: TransactionRetryWithProtoRefreshError: ReadWithinUncertaintyIntervalError: read at time 1735344596.246113077,0 encountered previous write with future timestamp 1735344596.478577328,0 within uncertainty interval `t <= (local=1735344596.746113077,0, global=1735344596.746113077,0)`; observed timestamps: [{2 1735344598.610798995,0} {3 1735344596.246113077,0}]: "sql txn" meta={id=a54c7d78 key=/Min pri=0.01119841 epo=0 ts=1735344596.246113077,0 min=1735344596.246113077,0 seq=0} lock=false stat=PENDING rts=1735344596.246113077,0 wto=false gul=1735344596.746113077,0
at /home/ps/main/node_modules/pg-pool/index.js:45:11
at processTicksAndRejections (node:internal/process/task_queues:95:5)
at Object.list (/home/ps/main/server/chat-plugins/chatlog.ts:122:20)
at Object.listCategorized (/home/ps/main/server/chat-plugins/chatlog.ts:130:16)
at Object.list (/home/ps/main/server/chat-plugins/chatlog.ts:432:16)
at PageContext.resolve (/home/ps/main/server/chat.ts:471:10)
at CommandContext.join (/home/ps/main/server/chat-commands/moderation.ts:503:15)

This PR adds a small generic helper function to re-run queries when any error occurs, up to a limited number of retries.

[DieterReinert]

We could potentially add or improve these things in our safeQuery function:

• Configurable Delay or Backoff
  Add a delay between retries (either fixed or exponential).

  // Example delay usage inside the loop
  await new Promise(resolve => setTimeout(resolve, 1000)); // 1 second

• Custom Error Handling
  Skip retries for certain error types if desired.

  // Example signature
  async function safeQuery<T>(
    fn: () => Promise<T>,
    attempts = 3,
    shouldRetry?: (error: Error) => boolean
  ): Promise<T> { /* ... */ }

• Timeout Handling
  Implement a timeout on each attempt (e.g., using Promise.race) to handle operations that might hang indefinitely.

[DieterReinert]

Another Stack Trace:

A chat page crashed: error: restart transaction: TransactionRetryWithProtoRefreshError: ReadWithinUncertaintyIntervalError: read at time 1736859296.170169540,0 encountered previous write with future timestamp 1736859296.456404574,0 within uncertainty interval `t <= (local=1736859296.670169540,0, global=1736859296.670169540,0)`; observed timestamps: [{1 1736859296.170169540,0} {2 1736859298.725285111,0} {3 1736859296.172367391,0}]: "sql txn" meta={id=9145c423 key=/Min pri=0.02228827 epo=0 ts=1736859296.170169540,0 min=1736859296.170169540,0 seq=0} lock=false stat=PENDING rts=1736859296.170169540,0 wto=false gul=1736859296.670169540,0
at /home/ps/main/node_modules/pg-pool/index.js:45:11
at processTicksAndRejections (node:internal/process/task_queues:95:5)
at Object.list (/home/ps/main/server/chat-plugins/chatlog.ts:122:20)
at Object.listCategorized (/home/ps/main/server/chat-plugins/chatlog.ts:130:16)
at Object.list (/home/ps/main/server/chat-plugins/chatlog.ts:432:16)
at PageContext.resolve (/home/ps/main/server/chat.ts:471:10)
at CommandContext.join (/home/ps/main/server/chat-commands/moderation.ts:503:15)