MINOR: Move more expression code to datafusion-expr
crate
#2669
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Which issue does this PR close?
N/A
Rationale for this change
Ongoing refactoring - this helps with moving optimizer rules to their own crate
What changes are included in this PR?
Move code around. No functional changes.
Are there any user-facing changes?
No. I added re-exports from the old location.
Does this PR break compatibility with Ballista?
No