Use query parameters for additional search views in Nuxt

[obulat]

Fixes

Fixes #3864 by @obulat

Description

This PR updates the frontend implementation to use the query parameters instead of path parameters:

• /image/tag/cat -> /image/collection?tag=cat
• /image/source/wikimedia -> /image/collection?source=wikimedia
• /image/source/wikimedia/creator/me -> /image/collection?source=wikimedia&creator=me

It updates pages, stores, collection middleware and API service.

Pages

The two pages (tag/_tag.vue and source/_vue) with a single collection.vue page (which is duplicated for each media type). The parsing and setting of collectionParams was removed from the setup function and moved to the collection middleware.

Store

getCollectionPath function is updated to create a path using collection path part and relevant query parameters.
This function is used for the source and creator link buttons, tags, the sources table.

API requests

The store collection parameters are converted to an API request URL. For now, before the API changes are implemented, we can use the search without q parameter: the full-text search within tags, creator and source.
The following request URLS are used in this PR:

• /images?unstable__collection=tag&tags=cat
• /images?unstable__collection=source&source=flickr
• /images?unstable__collection=creator&source=flickr&creator=me

The API currently ignores the unstable__collection parameter.
When the API changes are implemented, tags will be replaced with unstable__tag, and from then on the real collections with exact matches and sorted by newest will be returned.

Important limitation
After these changes, the collection pages are not loaded on SSR because the CollectionPage sets the value of results before media is fetched, and server renders an empty result list. The follow-up PR that will use the new VMediaCollection component from #3831, and fix this problem.

Testing Instructions

Make sure that additional_search_views is on on the /preferences page.
Navigate to tags, creator and source views from the single result pages. The client-side navigation should work correctly. Note that there will be times that the page renders only the loading skeletons. This problem will be solved in a separate PR.

Checklist

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• 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.
• I ran the DAG documentation generator (if applicable).

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