Support the Array of Struct

[goldmedal]

Is your feature request related to a problem? Please describe.
After #914, we support Array and Struct type. However, the array of struct isn't supported now.

SELECT struct_array[1].f1 from t1

Describe the solution you'd like
Because this syntax isn't supported by DataFusion, we should add this on the DataFusion side first.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.

[goldmedal]

There are some required works for this issue

• Enhance the nested type access for Generic and DuckDB dialect apache/datafusion-sqlparser-rs#1541
• Plan the access chain for the nested type
• Unparse the plan back to sql