Migrate away from ExtensionUtil

[redox]

Following duckdb/duckdb#17772 - we need to change the way the extensions are initialized. This fixes the compilation of the extension with DuckDB's current HEAD.

[utay]

Fix #10

[hatamiarash7]

Thanks for the contribution ❤️ .
I think you forgot to update the duckdb submodule, so the tests failed. I will do that before release.

[redox]

I think you forgot to update the duckdb submodule, so the tests failed. I will do that before release.

Ah gosh, thank you - I'll check how you're proceeding to do this.