Support dot syntax access field for Map type column

[hanjm]

Use case

Currently, access Map type column syntax is map['key'], mostly case map key is a strict string, could it support dot syntax access field for simplified? like map.key, it is more easy for input.

Describe the solution you'd like

dot access map field, like map.key

Additional context

1. ElasticSearch support dot syntax for document field access.
2. Javascript support dot access map object.
3. Python support dot access dictionary member. https://pypi.org/project/dotmap/

[alexey-milovidov]

Should not be implemented before #54864