databendlabs / openraft / 18443998704

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improve: implement non-blocking Respond queue

Introduce a separate queue system for pending responds to prevent
blocking the main command queue. Responds are now queued based on
their waiting conditions (log IO flushed, log applied, snapshot
built) and sent when conditions are satisfied.

Add `PendingResponds` struct with four queues (`on_log_io`,
`on_log_flush`, `on_apply`, `on_snapshot`) to hold responds
waiting for different IO completion events. Implement
`drain_satisfied()` iterator that checks current IO state and
yields responds whose conditions are met.

Add `send_satisfied_responds()` method to `RaftCore` that
periodically checks and sends all satisfied responds. This method
is called in the command processing loop to ensure responds are
sent promptly when conditions become satisfied.

Simplify condition checking by adding `Condition::is_met()` method
that encapsulates the logic for checking if IO state satisfies a
condition. Remove duplicated condition checking code from
`run_command()`.

Change `Condition` enum variants to use non-optional `LogId` values
since conditions always require specific log IDs to wait for.
Update `Condition::Display` to show threshold comparisons using
">=" operator for clarity.

Add `CommandKind::Respond` variant to classify respond commands
separately, enabling parallel execution with other command types.

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