Make the KedroPipelineModel custom mlflow model able to serve a Pipeline instead of only PipelineML

[Galileo-Galilei]

Description

Close #171

Development notes

What have you changed, and how has this been tested?

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

Notice

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[Galileo-Galilei]

The tests are failing because of pypa/pip#10573, the proposed solution is to use pip install -e .[test,extras] --no-use-pep517 and wait for an official fix.

[codecov-commenter]

Codecov Report

Merging #249 (4bddf83) into master (904207a) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #249   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           33        33           
  Lines         1034      1037    +3     
=========================================
+ Hits          1034      1037    +3     

Impacted Files	Coverage Δ
kedro_mlflow/pipeline/__init__.py	100.00% <ø> (ø)
kedro_mlflow/framework/hooks/pipeline_hook.py	100.00% <100.00%> (ø)
kedro_mlflow/mlflow/kedro_pipeline_model.py	100.00% <100.00%> (ø)
kedro_mlflow/pipeline/pipeline_ml.py	100.00% <100.00%> (ø)

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