Celery task for SOL-174

[marjev]

@martynjames Here's the work Davorin did for creating a celery task to do the indexing once the changes in course are published.

This is just a review PR, still not ready for merging.

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[openedx-webhooks]

Thanks for the pull request, @marjev! It looks like you're a member of a company that does contract work for edX. If you're doing this work as part of a paid contract with edX, you should talk to edX about who will review this pull request. If this work is not part of a paid contract with edX, then you should ensure that there is an OSPR issue to track this work in JIRA, so that we don't lose track of your pull request.

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[martynjames]

This file has a number of pylint violations

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Thanks for the pull request, @marjev! It looks like you're a member of a company that does contract work for edX. If you're doing this work as part of a paid contract with edX, you should talk to edX about who will review this pull request. If this work is not part of a paid contract with edX, then you should ensure that there is an OSPR issue to track this work in JIRA, so that we don't lose track of your pull request.

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[martynjames]

Closing for now, this work will eventually be incorporated into https://github.com/edx/edx-platform/pull/7313