Set builder name from module instead of class

[albertvillanova]

Now the builder name attribute is set from from the builder class name.

This PR sets the builder name attribute from the module name instead. Some motivating reasons:

• The dataset ID is relevant and unique among all datasets and this is directly related to the repository name, i.e., the name of the directory containing the dataset
• The name of the module (i.e. the file containing the loading loading script) is already relevant for loading: it must have the same name as its containing directory (related to the dataset ID), as we search for it using its directory name
• On the other hand, the name of the builder class is not relevant for loading: in our code, we just search for a class which is subclass of DatasetBuilder (independently of its name). We do not put any constraint on the naming of the builder class and indeed it can have a name completely different from its module/direcotry/dataset_id

IMO it makes more sense to align the caching directory name with the dataset_id/directory/module name instead of the builder class name.

Fix #4381.

[HuggingFaceDocBuilderDev]

The documentation is not available anymore as the PR was closed or merged.

[lhoestq]

Thanks ! I agree this is the right way to fix this