gpt-oss 20b support

[chochowski]

What does this PR do?

Adds gpt-oss-20b support for puzzle any-model pruning.

Type of change:
new feature

Overview:
adds descriptor, converter and yaml configuration files for expert removal. Introduces slight changes on conversion to account for mxfp4 quantized checkpoint of gpt-oss

Usage

# Add a code snippet demonstrating how to use this

Testing

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[danielkorzekwa]

seems wrong

[danielkorzekwa]

is it needed if we prune for num_of_experts?

[danielkorzekwa]

Let's not put it at the same level as ## Advanced Usage, I would put it into a separate MD file (in the model descriptor dir) and link nicely in the main tutorial. Consult also with @LianaMikael how best to do it. We want the tutorial to have a great user experience.

Let's also check for English style/grammar. E.g. should be no ',' after that. , likely comma after 'n the prunning steps '