feat(defaults): use ripgrep (rg) for 'grepprg' if available

runtime/lua/vim/_defaults.lua

@@ -496,3 +496,11 @@ if tty then
     end
   end
 end
+
+--- Default 'grepprg' to ripgrep if available.
+if vim.fn.executable('rg') == 1 then
+  -- Match :grep default, otherwise rg searches cwd by default
+  -- Use -uuu to make ripgrep not do its default filtering
+  vim.o.grepprg = 'rg --vimgrep -uuu $* ' .. (vim.fn.has('unix') == 1 and '/dev/null' or 'nul')
+  vim.o.grepformat = '%f:%l:%c:%m'
+end