[WIP] Adding Google SVQ dataset + some refactoring

[silky1708]

• I have outlined why this dataset is filling an existing gap in mteb
• I have tested that the dataset runs with the mteb package.
• I have run the following models on the task (adding the results to the pr). These can be run using the mteb run -m {model_name} -t {task_name} command.
  • sentence-transformers/paraphrase-multilingual-MiniLM-L12-v2
  • intfloat/multilingual-e5-small
• I have checked that the performance is neither trivial (both models gain close to perfect scores) nor random (both models gain close to random scores).
• I have considered the size of the dataset and reduced it if it is too big (2048 examples is typically large enough for most tasks)

If you add a model or a dataset, please add the corresponding checklist:

• dataset checklist
• model checklist

[Samoed]

After #3528 you need to inherit from AbsTaskRetrieval