[Minor]: support window functions in order by expressions

[buraksenn]

Which issue does this PR close?

• Closes Support for window functions in order by expression #608.

Rationale for this change

#608 has details but as @alamb describes in #608 (comment)

SELECT c2
  FROM test
  ORDER BY max(c3) OVER (ORDER BY c9);

fails with:

This feature is not implemented: Physical plan does not support logical expression WindowFunction(WindowFunction { fun: AggregateUDF(AggregateUDF { inner: Max { signature: Signature { type_signature: UserDefined, volatility: Immutable, parameter_names: None } } }), params: WindowFunctionParams { args: [Column(Column { relation: Some(Bare { table: "test" }), name: "c3" })], partition_by: [], order_by: [Sort { expr: Column(Column { relation: Some(Bare { table: "test" }), name: "c9" }), asc: true, nulls_first: false }], window_frame: WindowFrame { units: Range, start_bound: Preceding(Int32(NULL)), end_bound: CurrentRow, is_causal: false }, filter: None, null_treatment: None, distinct: false } })

What changes are included in this PR?

• relevant change
• slt and unit tests

Are these changes tested?

Yes added both unit tests for plan and slt tests for checking output

Are there any user-facing changes?

Additive user changes that users can now use window in order by expressions