add `PhysicalExpr` to support, Selective Aggregates feature using `FILTER` clause

[poonai]

Which issue does this PR close?

#2214

Add support for adding filter to aggregation.

eg: AGGREGATE(input) FILTER (WHERE condition)

Closes #2214

What changes are included in this PR?

• ExprWithFilter is added so that expr can be evaluated based on the given filter.
• ExprWithFilter is used in aggregate functions if it contains filter
• filtered column name will be added to the TableScan's projection by making expression visitors to visit aggregate function filters

[poonai]

@andygrove it's done. Please have a look and let me know :)

[alamb]

I am not sure what the current status of this PR is and it is not passing CI, so marking it as "draft" -- please mark it as ready for review when it is

[poonai]

@alamb I've fixed the test. Yes, it's ready for review.

[andygrove]

@alamb PTAL when you can. LGTM but I have not been working so closely with physical execution lately.

[alamb]

I am sorry I don't have time to review this PR 😭

[poonai]

Hey @alamb

No worries, I’ll close this for now. We can rework this when this is relevant again or someone can take this work again and patch it

[alamb]

Thanks and sorry @poonai