[IMP] website_slides: add tags and tag groups on channel

Purpose is to be able to filter, search and categorize channels. Notably
with eLearning in mind there will be more channels as a channel will also be
used to hold lessons.

For that purpose we add a model of tag linked to channels. Those tags are
organized by groups in order to be able to display them using a menu or
a small hierarchy of tags. Displaying a tag group as a specific navigation
element is controlled by a specific field.

Those models will be used to display a new and improved home page for
channels / courses.

This commit is linked to task ID 1936153 and PR #30985.

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