add parameter use_key_value_cache to BartAsPointerNetworkConfig

[ArneBinder]

this allows to disable the key-value-cache for generation with the pointer model

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 95.45%. Comparing base (6b64aa5) to head (ee56ddb).

Files with missing lines	Patch %	Lines
...ules/models/base_models/bart_as_pointer_network.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #140      +/-   ##
==========================================
- Coverage   95.46%   95.45%   -0.02%     
==========================================
  Files          61       61              
  Lines        5120     5125       +5     
==========================================
+ Hits         4888     4892       +4     
- Misses        232      233       +1     

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