Pointer network for multi spans

[ArneBinder]

TODO

• use parse() instead of decode() to get the annotations and follow-up candidates
  • SpanEncoderDecoder.parse(): correctly incorporate exclusive_end_offset!
  • tests for all parse() implementations
  • how to handle dummy loop relations? Just not, i.e. head==tail and label=none_label? Edit: just keep it as it is, also see 447e41e
  • use parse() in decode_relations() for decoding
  • use parse() in _prefix_allowed_tokens_fn_with_maximum() to get follow-up candidate indices
  • use parse() in build_constraints()
• add MultiSpanEncoderDecoder
  • implement, see 3d6a996
  • tests
• create position_ids from input_ids instead of using decoder_position_id_pattern, see create position_ids based on a mapping (PointerHead) #67
• test in real setup (sciarg with resolved parts_of_same), see https://github.com/ArneBinder/pie-document-level/pull/204

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 88.73239% with 48 lines in your changes are missing coverage. Please review.

Project coverage is 95.06%. Comparing base (63e77fe) to head (35d3412).

Files	Patch %	Lines
...ules/taskmodules/pointer_network_for_end2end_re.py	78.57%	30 Missing ⚠️
...ules/pointer_network/annotation_encoder_decoder.py	94.26%	14 Missing ⚠️
src/pie_modules/taskmodules/common/interfaces.py	90.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #63      +/-   ##
==========================================
- Coverage   95.90%   95.06%   -0.84%     
==========================================
  Files          54       54              
  Lines        3927     4232     +305     
==========================================
+ Hits         3766     4023     +257     
- Misses        161      209      +48     

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