[roadmap-track] Cost based optimizer(CBO)

Main issue tracking for Cost based optimizer.

# Queries

| Queries                                         | Status    | Release Target | Comments        | 
| ----------------------------------------------- | --------- | -------------- | --------------- | 
| [count(*) with table statistics #914](https://github.com/datafuselabs/datafuse/issues/914)  | DONE  | v0.5  | |
| [exact min/max with table statistics #997](https://github.com/datafuselabs/datafuse/issues/997)  | PLANNING  | v0.5  | |

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[roadmap-track] Cost based optimizer(CBO) #915

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Queries	Status	Release Target	Comments
count(*) with table statistics #914	DONE	v0.5
exact min/max with table statistics #997	PLANNING	v0.5