Improve pydantic model translation

[kevinjacobs-delfi]

Improve pydantic model translation

• translating pydantic field descriptions to record field docs
• renames AvroModel.config -> AvroModel.dacite_config in order to avoid collisions with model fields
• render record title as schema doc
• Accept kwargs on AvroModel.avro_schema and pass to json.dumps

[marcosschroh]

Could you add a test to check the fields and schema documentation?

[codecov]

Codecov Report

Attention: Patch coverage is 95.23810% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 99.50%. Comparing base (1d6ef42) to head (bf7564c).
Report is 49 commits behind head on master.

Files	Patch %	Lines
dataclasses_avroschema/pydantic/parser.py	93.75%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #582      +/-   ##
==========================================
+ Coverage   99.18%   99.50%   +0.32%     
==========================================
  Files          30       33       +3     
  Lines        1712     1812     +100     
  Branches      307        0     -307     
==========================================
+ Hits         1698     1803     +105     
- Misses          6        9       +3     
+ Partials        8        0       -8     

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