Improved doc analyzer task decorator to do more I/O handling

[JSv4]

Lets devs work with raw text input and have a simple text output format. Still WIP.

[codecov]

Codecov Report

Attention: Patch coverage is 85.41667% with 7 lines in your changes missing coverage. Please review.

Project coverage is 78.43%. Comparing base (0a801a4) to head (cd6b644).
Report is 19 commits behind head on main.

Files	Patch %	Lines
opencontractserver/shared/decorators.py	87.50%	5 Missing ⚠️
opencontractserver/tasks/corpus_tasks.py	85.71%	1 Missing ⚠️
opencontractserver/utils/etl.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #185      +/-   ##
==========================================
+ Coverage   78.31%   78.43%   +0.12%     
==========================================
  Files          61       61              
  Lines        2882     2917      +35     
==========================================
+ Hits         2257     2288      +31     
- Misses        625      629       +4     

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