Add __init__.py to harmony_search

[mtyaka]

Without this, the module does not get installed correctly when installing the package with pip.

Test instructions:

1. Create a fresh virtual environment.
2. Install harmony plugin without this patch: pip install "git+https://github.com/openedx/openedx-k8s-harmony.git@harmony-chart-0.5.1#egg=tutor-contrib-harmony-plugin&subdirectory=tutor-contrib-harmony-plugin"
3. Start the python interpreter and try to import the harmony_search module: from tutor_k8s_harmony_plugin.harmony_search.base import BaseSearchAPI; you will get an import error
4. Uninstall the plugin and re-install a version with this patch: pip uninstall -y tutor-contrib-harmony-plugin && pip install "git+https://github.com/open-craft/openedx-k8s-harmony.git@mtyaka/add-init-files#egg=tutor-contrib-harmony-plugin&subdirectory=tutor-contrib-harmony-plugin"
5. Run the python interpreter again and verify that you can successfully import the module this time: from tutor_k8s_harmony_plugin.harmony_search.base import BaseSearchAPI

[openedx-webhooks]

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[gabor-boros]

@mtyaka Could you please bump the version number in the __about__.py?

https://github.com/openedx/openedx-k8s-harmony/blob/main/tutor-contrib-harmony-plugin/tutor_k8s_harmony_plugin/__about__.py#L1

[mtyaka]

@mtyaka Could you please bump the version number in the __about__.py?

@gabor-boros Done. I set it to 0.5.1 to match the value in Chart.yaml.

[gabor-boros]

@mtyaka I updated the version number to be 0.2.0 instead of 0.5.1. Although I see the point of having matching version numbers, the plugin is basically separate from the chart, it is just shipped in the same repo as the chart. I'm going to quickly approve and merge this change, so we reduce the back and forth.

[openedx-webhooks]

@mtyaka 🎉 Your pull request was merged! Please take a moment to answer a two question survey so we can improve your experience in the future.