[Tech Request]: pipeline refactoring, don't break pipelines if possible

[badboynt1]

Is there an existing issue for the same tech request?

• [X] I have checked the existing issues.

Does this tech request not affect user experience?

• [X] This tech request doesn't affect user experience.

What would you like to be added ?

pipeline重构，任何情况下，能不打断pipeline就不要打断。

特别是对于优化器判定为tp的query，需要保证
1. 一定在单cn，单并发执行。
2. 不产生任何额外的goroutine
3. pipeline不断开，不使用channel传递batch
4. 不出现connector，merge，dispatch等算子，必要时使用一个新的exchange算子来连接pipeline。exchange算子直接调用对应scope的root operator call，返回batch
5  对于某些特定算子的优化，例如mergesort,mergegroup,mergelimit,以及join等等

Why is this needed ?

No response

Additional information

No response

[fengttt]

https://github.com/matrixorigin/matrixone/commit/c37e5be9e6e37c29baa9b739b98bf6befbdaad50

[fengttt]

17778 is reverted by #17787