Fix the to_one relationship and enhance the testing

[goldmedal]

Changed

• The to_one relationship is available now.
• Ensure the generated plan is executable for DataFusion.
  • If table providers are registered, generate the DefaultTableSource for remote table sources.
  • If no, generate the LogicalTableSource for remote table sources. (It can't be executed by DataFusion)
• Enhance the end to end testing

[grieve54706]

Why remove the schema?

[goldmedal]

The testing context, RemoteContextProvider, only register the table name without the schema. In this case, the table reference shouldn't have schema prefix.