Add minishlab models (model2vec)

[KennethEnevoldsen]

We have these in the results repo, but we do not have an implementation in the repo. These are also very good integration test models due to their very small size and low number of dependencies.

'minishlab/M2V_base_glove',
'minishlab/M2V_base_glove_subword',
'minishlab/M2V_base_output',
'minishlab/potion-base-2M',
'minishlab/potion-base-4M',
'minishlab/potion-base-8M',

You can find the documentation on custom models here and you can find an example of an implementation here

[KennethEnevoldsen]

@HadiaSamil will take a stab at this problem here

A good step by step approach:

is to

1. implement to model and have it run on MTEB (using some task)
2. once that works integrate into the mteb package

[KennethEnevoldsen]

related to #1515

[x-tabdeveloping]

These were added a week and a half ago