feat(avro): add simple avro writer

[Uinelj]

No description provided.

[codecov]

Codecov Report

Merging #51 (14fb3f7) into dev (a266fa3) will decrease coverage by 0.15%.
The diff coverage is 55.55%.

@@            Coverage Diff             @@
##              dev      #51      +/-   ##
==========================================
- Coverage   65.05%   64.90%   -0.16%     
==========================================
  Files          40       41       +1     
  Lines        3091     3160      +69     
==========================================
+ Hits         2011     2051      +40     
- Misses       1080     1109      +29     

Impacted Files	Coverage Δ
src/io/langfiles.rs	76.82% <0.00%> (-14.48%)	⬇️
src/pipelines/oscardoc/pipeline.rs	0.00% <0.00%> (ø)
src/io/writer/writer_doc_avro.rs	72.72% <72.72%> (ø)

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