Prioritize current schema for pg type generation

[yilinjuang]

What kind of change does this PR introduce?

Bug fix

What is the current behavior?

If multiple schemas have enum types with the same name, the generated enum types all use the same schema, which is the first schema returned by pgMeta.types.list().

export type Database = {
  schema_1: {
    Tables: {
      table_name: {
        Row: {
          type: Database["schema_1"]["Enums"]["some_enum"];
        };
      };
    };
    Enums: {
      some_enum: "some_value" | "some_other_value";
    };
  };
  schema_2: {
    Tables: {
      table_name: {
        Row: {
          // schema_1 is used here
          type: Database["schema_1"]["Enums"]["some_enum"];
        };
      };
    };
    Enums: {
      some_enum: "some_value" | "some_other_value";
    };
  };
};

What is the new behavior?

If the current/self schema has the enum type, generated enum type will use the current schema instead of the first schema.

export type Database = {
  schema_1: {
    Tables: {
      table_name: {
        Row: {
          type: Database["schema_1"]["Enums"]["some_enum"];
        };
      };
    };
    Enums: {
      some_enum: "some_value" | "some_other_value";
    };
  };
  schema_2: {
    Tables: {
      table_name: {
        Row: {
          // schema_2 is used here
          type: Database["schema_2"]["Enums"]["some_enum"];
        };
      };
    };
    Enums: {
      some_enum: "some_value" | "some_other_value";
    };
  };
};

Additional context

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