Add support for %load_ext kedro

[ravi-kumar-pilla]

Description

Resolves #4063

Development notes

• Added load_ipython_extension function in kedro/__init__.py to make kedro available as ipython ext
• Relaxed importlinter to ignore missing contracts
• Added pytest

QA notes

• Install kedro (pip install git+https://github.com/kedro-org/kedro@feat/load_ext)
• Run ipython in the terminal
• Run %load_ext kedro to check if kedro is available as ipython extension. kedro should be recognized as ipython extension and it should load other magic methods like (%reload_kedro, %load_node)

Developer Certificate of Origin

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Checklist

• Read the contributing guidelines
• Signed off each commit with a Developer Certificate of Origin (DCO)
• Opened this PR as a 'Draft Pull Request' if it is work-in-progress
• Updated the documentation to reflect the code changes
• Added a description of this change in the RELEASE.md file
• Added tests to cover my changes
• Checked if this change will affect Kedro-Viz, and if so, communicated that with the Viz team

[merelcht]

The code looks good. Can you provide some steps on how to test it manually?

[astrojuanlu]

I confirm it works!

$ uv run ipython
... 
In [1]: %load_ext kedro
[01/14/25 15:47:45] INFO     Using '/Users/juan_cano/Projects/QuantumBlackLabs/Kedro/kedro/kedro/framework/project/rich_logging.yml' as logging configuration.                __init__.py:270
                    INFO     Registered line magic '%reload_kedro'                                                                                                             __init__.py:61
                    INFO     Registered line magic '%load_node'                                                                                                                __init__.py:63

[merelcht]

Tested it and it works well 👍