Is your feature request related to a problem or challenge?

Substrait has a number of mechanisms that allow users to define custom functionality. These include:

• Extension Tables for defining new table types.
• Extension Relations for adding entirely new relation types.
• User-Defined Types for adding custom types.
• User-Define Functions for adding custom functions.
• Advanced Extensions for modifying existing relations.

The current Substrait consumer has limited support for handling this custom functionality.

Describe the solution you'd like

As a user I would like to be able to re-use most of the DataFusion Substrait consumer code, but also be able to configure and/or provide handlers for our custom functionality.

Describe alternatives you've considered

No response

Additional context

No response