Fix some bugs

[liyuheng55555]

To prevent integer overflow from too many data points in one query.

[liyuheng55555]

1. Avoid overflow by changing the type of the intermediate variable queryResultPointNum from AtomicInteger to AtomicLong.
2. Correct the point counting method for the latest point query in iotdb.
3. Fix error messages when using ns/us.
4. Skip calculating time quantiles when the result size is 1 to prevent exceptions.