Add partial matches for the Document/Attachment Does Not Exist suggestions

In XWIKI-5373 we have added suggestions for not found documents or attachments. We are currently searching using indexed solr data (stemmed) and also using fuzzy searches (string difference of 2; helps with minor typos).

What`s currently missing is partial matches. For example "Sandb" is matched by the fuzzy search, since it has a difference of 2 characters ("ox"), but "Sand" is not matched by anything (no stemming and too greater string difference - 3).

Partial matches, using wildcards, would help with this (as an addition), since it would look for "*Sand*" and it will match "Sandbox".