Filter unsupported extensions
I used a regex to filter the data files based on their extension for packaged builders.

I tried and a regex is 10x faster that using `in` to check if the extension is in the list of supported extensions.

Supersedes https://github.com/huggingface/datasets/pull/5850

Close https://github.com/huggingface/datasets/issues/5849

I also did a small change to favor the parquet module in case of a draw in the extension counter.