Version listing page: add "Show all versions matching {query}" item

[humitos]

I'm opening this issue here to not loose the conversation we had in a PR.

• Change version filter to allow substrings readthedocs.org#11258

Summarizing, we want to add a Show all versions matching {query} item in the list of results that hits the server and returns a filtered list of versions matching that query using icontains filter.

If you want to know more details, read it from the PR