Refactor `TableFunctionImpl` to a separate module

[2010YOUY01]

Is your feature request related to a problem or challenge?

Background: #13540 (comment)
After #13540 is merged, there is a refactor can be done:

• Move TableFunctionImpl to a separate module
• Add name() method under the trait to keep it consistent with other functions (Like user-defined aggregate function)

Describe the solution you'd like

No response

Describe alternatives you've considered

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Additional context

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[jonathanc-n]

take

[linhr]

It would be valuable if as_any() can be part of the TableFunctionImpl trait, so that the table function can be cast to the concrete type via downcast_ref().