Convert media store to an options store

[obulat]

Fixes

Related to #1254 by @obulat
Fixes #1235 by @sarayourfriend

Description

This PR does two main things:

1. converts media store to an options store to fix the server state hydration issues.
2. Extracts the media-item state (for single image/audio pages).

The extraction of the media-item makes it possible to re-use the media item information from the search results on the single media detail page, instead of fetching it every time, even when we already have this data in the store.
It also refactors the single image detail page to get the media data in the asyncData.

Testing Instructions

The media store is the backbone of the app state, so all of these critical paths could be affected, and should not have any problems after this PR:
Searching for audio/image from homepage, search page and content pages on server-rendered (opened URL directly) and client-rendered (opened by following an internal link) pages.
Server-rendered search pages (All Content, image and audio) with no results, with fewer than 20 results and with more than 20 results should be interactive (at the minimum, you should be able to click on the content switcher and change the search type.
Clicking on "Load more".
Selecting a filter and deselecting it, or going back using the browser back button.

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
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• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.

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[sarayourfriend]

Seems to work well! I tested thoroughly and am still just running into the same bugs I found earlier today. Once these are all merged it'll be easier to tell what needs to be fixed still.

[zackkrida]

LGTM.

[sarayourfriend]

This branch appears to fix the load more crashing the SSR audio results page as well 🙂 http://localhost:8443/search/audio?q=galah on this branch does not crash.