FIX #70 - Enforce input schema when logging a PipelineML

[Galileo-Galilei]

Description

This PR close #70 and #106.

Development notes

• Update the requirements to upgrade isort
• Update the pre-commit with isort
• New isortversion modfies a lot of docstring in the codebase
• Add missing links in the changelog
• Add a model_signature argument in PipelineML and pipeline_ml_factory whichenable the user to:
  • infer automatically the schema of the input when logging in mlflow (default)
  • do nothing
  • pass a custom made schema for validating both the input and the output

Checklist

• Read the contributing guidelines
• Open this PR as a 'Draft Pull Request' if it is work-in-progress
• Update the documentation to reflect the code changes
• Add a description of this change and add your name to the list of supporting contributions in the CHANGELOG.md file. Please respect Keep a Changelog guidelines.
• Add tests to cover your changes

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