feat(substrait): modular substrait consumer (#13803)

* feat(substrait): modular substrait consumer

* feat(substrait): include Extension Rel handlers in default consumer

Include SerializerRegistry based handlers for Extension Relations in the
DefaultSubstraitConsumer

* refactor(substrait) _selection -> _field_reference

* refactor(substrait): remove SubstraitPlannerState usage from consumer

* refactor: get_state() -> get_function_registry()

* docs: elide imports from example

* test: simplify test

* refactor: remove Arc from DefaultSubstraitConsumer

* doc: add ticket for API improvements

* doc: link DefaultSubstraitConsumer to from_subtrait_plan

* refactor: remove redundant Extensions parsing

Author: vbarua