Backport this additive mod-info API to the 1.20.1 API line as 15.21.0 instead of copying the source branch's 17.1.0 version.

Keep the target branch's existing ingredient-alias search and split startup flow while adding mod alias registration for @ searches.

(cherry picked from commit 31b2f139e0d82c160a4ccd51fac3a416f2b3a2aa)