[ES|QL] Consider min/max from predicates when transform date_trunc/bucket to round_to option 2

[fang-xing-esql]

This is the second option to implement considering min/max from predicates when transform date_trunc/bucket to round_to. Instead of doing the transformation within each function by implementing LocalSurrogateExpression #131341 , this approach create a dedicated rule to transform date_trunc/bucket to round_to.

[elasticsearchmachine]

Hi @fang-xing-esql, I've created a changelog YAML for you.

[elasticsearchmachine]

Pinging @elastic/es-analytical-engine (Team:Analytics)

[astefan]

LGTM
I think this is the better approach than the one of LocalSurrogateExpression. The code is easier to read/follow and the logic makes more sense like this. Thank you!

[fang-xing-esql]

Thanks a lot for reviewing @astefan !

[nik9000]

Progress!

I think it'd be nice to have the rule be pluggable in some way - there are other things we're going to do this with. But let's do that when have another one or two.