Add artist_sort as the last entry in the artists to search

[hashhar]

This will handle cases where the artist name includes some
characters which can cause a search failure for some
websites - mainly unicode.

Fixes #3340.

[hashhar]

@sampsyo I've got this working. I was now looking to add tests and could figure out the new cases that will go into LyricsPluginTest.test_search_artist test cases.

But I can see that there are also some integration tests which make actual network requests to verify things but it looks like they are testing the web scraping part (beautiful soup) instead of the actual plugin logic.

What do you think I should do for this change? Is a new test case which verifies that the search_pairs includes the artist_sort is enough? Or should I do something else?

[sampsyo]

Nice! Looks great!!

For this, I think just testing search_pairs should be enough. Plugging that in to a mocked web request seems like it doesn't add too much.

[hashhar]

@sampsyo This looks good now. Let me know if there are any docs or changelogs that need editing.

[sampsyo]

Looks perfect!! Merged with a quick changelog entry. ✨