Enhance the nested type access for Generic and DuckDB dialect

[goldmedal]

Description

• Close Improve CompositeAccess to enhance the struct type #1533
• Allow Generic and DuckDB dialects to parse the access chain of a nested type like

select c1[1].f1.f2[2] from t1

• make support_period_map_access_key configurable.

TODO items

• allow the SQL access the map element from a function call: SELECT named_struct('a', 1, 'b', 2).a

[goldmedal]

We should refactor to integrate Subscript and MapAccessSyntax::Bracket, as they are similar and difficult to distinguish at the SQL layer.

For example, DuckDB allows the following SQL, which is currently invalid in our parser:

select [MAP {2:{a:1, b:[2,3,4]}}, MAP {2:{a:1, b:[2,3,4]}}][1][2][1].b[1:2] as result;
┌─────────┐
│ result  │
│ int32[] │
├─────────┤
│ [2, 3]  │
└─────────┘

The access pattern [1][2][1].b[1:2] includes both Subscript and MapAccess. We cannot parse all these as a MapAccessKey following the . token.

datafusion-sqlparser-rs/src/ast/mod.rs

Lines 805 to 808 in fad2ddd

	MapAccess {
	column: Box<Expr>,
	keys: Vec<MapAccessKey>,
	},