[KED-3023] Enable plugins to extend starter-aliases default list

[noklam]

Signed-off-by: noklam nok.lam.chan@quantumblack.com

Description

Taking over the original PR from #1265, would fix #1040

Development notes

• modified the _STARTERS_ALIASES to make it a dict with the format discussed in above issue.
• created a kedro.starter entrypoint which can is iterated over to update the _STARTERS_ALIASES constant.
• updated the kedro new and kedro starter list commands to use the updated _STARTERS_ALIASES constant (with new aliases discovered in the entrypoints).
• Refactor with KedroStarterSpec, the location is temp, it probably doesn't belong kedro.framework.cli.starters

The code can be run with

conda create -n fps python=3.8 -y
conda activate fps
pip install -e .  # Assume have the latest commit 
pip install git+https://github.com/noklam/fake-plugin-starter.git
kedro starter list

Todo

• Unit test + e2etest?
• Documentions

Screenshots

Checklist

• Read the contributing guidelines
• 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

[noklam]

It's in a good shape now and the PR should be functioning as it intended. Big thanks to @Galileo-Galilei to draft this PR initially and make it very easy for me to pick up.

I plan to do a bit more refactoring, so this 56ee39c will be my checkpoint in case I fail to :).

[noklam]

I am quite happy with the KedroStarterSpec class, I have been able to remove ~100 lines of code which come from the validation logic, some tests are removed too since it is impossible to have fields that are not defined.

[noklam]

The Window e2etest is failing with a very subtle error. When test_plugin is installed and run with ParallelRunner, the first few lines of log disappear in info.log but stdout did capture them. I doubt this is a bug somewhere in ParallelRunner but not related to this PR particularly.

[noklam]

The CI was failing because of a bug, once we have the fix the PR should pass again.

The bug was caused by the spawn process (Windows or MacOS >=3.8), because it will re-import everything.

Thanks @AntonyMilneQB for getting to the bottom of this!
The story roughly goes like this:

1. so basically the import from kedro.framework.cli.starters imports kedro.framework.cli en route
2. in __init__.py, it does from .cli import main
3. when cli is imported, it runs this: import kedro.config.default_logger, which reset the logger to the framework defaults.

[noklam]

@AntonyMilneQB Thanks a lot for your reviews!