feat(alias-finder): use ripgrep if possible (#13043)

Co-authored-by: Carlo Sala <carlosalag@protonmail.com>

plugins/alias-finder/alias-finder.plugin.zsh

@@ -43,7 +43,11 @@ alias-finder() {
       filter="^'?.{1,$((cmdLen - 1))}'?=" # some aliases is surrounded by single quotes
     fi
 
-    alias | grep -E "$filter" | grep -E "=$finder"
+    if (( $+commands[rg] )); then
+      alias | rg "$filter" | rg "=$finder"
+    else
+      alias | grep -E "$filter" | grep -E "=$finder"
+    fi
 
     if [[ $exact == true ]]; then
       break # because exact case is only one