Add sum statistics and PhysicalExpr::column_statistics

[gatesn]

Which issue does this PR close?

Fixes #992

Rationale for this change

Some statistics can propagate through expressions, such as min, max and sum.

In this particular case, I was looking at the ClickBench Q29 and realized we had no way to report sum statistics to DataFusion (which would also help for avg).

Q29 looks like this btw:

SELECT SUM("ResolutionWidth"), SUM("ResolutionWidth" + 1), SUM("ResolutionWidth" + 2), SUM("ResolutionWidth" + 3), SUM("ResolutionWidth" + 4), ... SUM("ResolutionWidth" + 88), SUM("ResolutionWidth" + 89) FROM hits;

What changes are included in this PR?

PhysicalExpr has a new defaulted trait function column_statistics that takes a Statistics and returns statistics for the columnar result of the expression. (Unlike the linked issue which proposes returning a full Statistics object).

Further, this PR adds a sum statistic to demonstrate the value of propagation (that turns into Precision::Absent on overflow).

Are these changes tested?

Are there any user-facing changes?

[gatesn]

Is there any combined script to run all the linting checks at once? I don't want to burn all your CI credits!

[gatesn]

Could I please grab another CI approval for this? I think I've run everything locally now