feat: support null_treatment, distinct, and filter for window functions in proto (apache#18024)

## Which issue does this PR close?

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- Closes apache#17417.

## Rationale for this change

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- Support `null_treatment`, `distinct`, and `filter` for window function
in proto.
- Support `null_treatment` for aggregate udf in proto.

## What changes are included in this PR?

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- [x] Add `null_treatment`, `distinct`, `filter` fields to
`WindowExprNode` message and handle them in `to/from_proto.rs`.
- [x] Add `null_treatment` field to `AggregateUDFExprNode` message and
handle them in `to/from_proto.rs`.
- [ ] Docs update: I'm not sure where to add docs as declared in the
issue description.

## Are these changes tested?

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- Add tests to `roundtrip_window` for respectnulls, ignorenulls,
distinct, filter.
- Add tests to `roundtrip_aggregate_udf` for respectnulls, ignorenulls.

## Are there any user-facing changes?

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N/A

---------

Co-authored-by: Jeffrey Vo <jeffrey.vo.australia@gmail.com>

Author: 2 people

datafusion/proto/proto/datafusion.proto

@@ -518,6 +518,7 @@ message AggregateUDFExprNode {
   LogicalExprNode filter = 3;
   repeated SortExprNode order_by = 4;
   optional bytes fun_definition = 6;
+  optional NullTreatment null_treatment = 7;
 }
 
 message ScalarUDFExprNode {
@@ -538,6 +539,9 @@ message WindowExprNode {
   // repeated LogicalExprNode filter = 7;
   WindowFrame window_frame = 8;
   optional bytes fun_definition = 10;
+  optional NullTreatment null_treatment = 11;
+  bool distinct = 12;
+  LogicalExprNode filter = 13;
 }
 
 message BetweenNode {
@@ -622,6 +626,11 @@ message WindowFrameBound {
   datafusion_common.ScalarValue bound_value = 2;
 }
 
+enum NullTreatment {
+  RESPECT_NULLS = 0;
+  IGNORE_NULLS = 1;
+}
+
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 // Arrow Data Types
 ///////////////////////////////////////////////////////////////////////////////////////////////////
@@ -1365,4 +1374,4 @@ message SortMergeJoinExecNode {
   JoinFilter filter = 5;
   repeated SortExprNode sort_options = 6;
   datafusion_common.NullEquality null_equality = 7;
-}
+}