#3000
#3001

Add BAAI/bge-m3-unsupervised Model
(BAAI/bge_m3_retromae is commented out - the details are proper, but it fails during loading the model for me, so i commented out)

• I have filled out the ModelMeta object to the extent possible
• I have ensured that my model can be loaded using
  • mteb.get_model(model_name, revision) and
  • mteb.get_model_meta(model_name, revision)
• I have tested the implementation works on a representative set of tasks.
• The model is public, i.e. is available either as an API or the wieght are publicly avaiable to download