add union types validation with pydantic

[felipao-mx]

• it uses pydantic.validate_arguments
• it is possible to define multiple validators for a task argument using pydantic. example:

@task(queue_url=QUEUE2_URL, region_name='us-east-1')
async def task_validator(message: Union[User, Company]) -> None:
    print(message.dict())

• it removes validator argument

[rogelioLpz]

Lo veo bien.
Solo puedes agregar un test en donde tenga validador y los datos incorrectos, creo que no hay test de eso

[codecov]

Codecov Report

Merging #193 (210d729) into main (570d811) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #193   +/-   ##
=======================================
  Coverage   99.46%   99.46%           
=======================================
  Files          10       10           
  Lines         371      371           
  Branches       52       52           
=======================================
  Hits          369      369           
  Misses          2        2           

Flag	Coverage Δ
unittests	99.46% <100.00%> (ø)

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Files	Coverage Δ
fast_agave/tasks/sqs_tasks.py	97.05% <100.00%> (ø)

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[felipao-mx]

si hay un test para cuando los datos son incorrectos: test_execute_tasks_with_validator