Add load class which loads model from local path

[MarleneKress79789]

Background:

• Currently, we use from_pretrained with the cache_dir option to load the model and upload the cache directory to the BucketFS
• The current approach in general works, but seems to check each time online if the model exists, or we have access and if we have the newest version
• This is not possible in some deployments
• To solve this issue, we could follow the following example using save_pretrained which stores the model into a directory which we then could upload
• We can then load the model with from_pretrained from a local path
• After we extracted the load class in Extract base_model_udf.load_models into separate class #144 , we can then create a new load function which loads the model from a local path during inference

Acceptance Criteria

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1. Create a load class, which uses a local path to load the model during inference
2. add tests for new load function
3. add documentaion for the new load function like doc strings, full user docu will be added in Use new functions with save_pretrained for model loading #146