Feat: support modify sink commit_checkpoint_interval

[chenzl25]

Is your feature request related to a problem? Please describe.

Currently, we only allow users to specify commit_checkpoint_interval when creating sinks, however, we don't allow users to change it at runtime which doesn't make sense to tell users recreate the sink to just modify commit_checkpoint_interval only. I think we can support a syntax like alter sink xxx set commit_checkpoint_interval = yyy to help users change this parameters.

We can support this feature in the same way as the rate limit does.

risingwave/src/stream/src/executor/mod.rs

Line 308 in 0c8b828

Throttle(HashMap<ActorId, Option<u32>>),

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