Move IO out of Ungoliant

[Uinelj]

Rely more on oscar-io to handle type definitions and Readers/Writers.

[codecov]

Codecov Report

Merging #83 (a006079) into dev (9bf4dcb) will decrease coverage by 2.12%.
The diff coverage is 46.15%.

❗ Current head a006079 differs from pull request most recent head e5d21d9. Consider uploading reports for the commit e5d21d9 to get more accurate results

@@            Coverage Diff             @@
##              dev      #83      +/-   ##
==========================================
- Coverage   45.64%   43.53%   -2.12%     
==========================================
  Files          27       26       -1     
  Lines        1310     1245      -65     
==========================================
- Hits          598      542      -56     
+ Misses        712      703       -9     

Impacted Files	Coverage Δ
src/identifiers/multilingual.rs	59.59% <ø> (ø)
src/io/langfiles.rs	69.23% <ø> (ø)
src/io/writer/writer_doc.rs	71.42% <ø> (ø)
src/pipelines/oscardoc/pipeline.rs	0.00% <0.00%> (ø)
src/processing/rebuild.rs	0.00% <ø> (ø)
src/transformers/content_detector.rs	100.00% <ø> (ø)
src/identifiers/identification.rs	75.00% <66.66%> (+19.44%)	⬆️
src/pipelines/oscardoc/types/document.rs

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