vim-patch:8.2.1665: cannot do fuzzy string matching

Problem:    Cannot do fuzzy string matching.
Solution:   Add matchfuzzy(). (Yegappan Lakshmanan, closes vim/vim#6932)
635414dd2f

Adjust Test_matchfuzzy's 2nd assert to expect the last error thrown, as
v8.2.1183 hasn't been ported yet (to be honest, the error message is kinda weird
if the 2nd argument is not convertible to string). We can still port this fully
as porting v8.2.1183 would require removing this change to pass CI.

src/nvim/eval.lua

@@ -249,6 +249,7 @@ return {
     matcharg={args=1, base=1},
     matchdelete={args={1, 2}, base=1},
     matchend={args={2, 4}, base=1},
+    matchfuzzy={args=2, base=1},
     matchlist={args={2, 4}, base=1},
     matchstr={args={2, 4}, base=1},
     matchstrpos={args={2,4}, base=1},