fix(lsp): rename fails on missing parent directory #27291

Problem:
If a rename results in a path that has missing parent directory(s), it
will fail.

Solution:
Do a recursive mkdir before attempting the rename.

runtime/lua/vim/lsp/util.lua

@@ -693,6 +693,9 @@ function M.rename(old_fname, new_fname, opts)
     end)
   end
 
+  local newdir = assert(vim.fs.dirname(new_fname))
+  vim.fn.mkdir(newdir, 'p')
+
   local ok, err = os.rename(old_fname, new_fname)
   assert(ok, err)